W205 C300 - stay away. Piston cracked at 65 K miles.
#226
MBWorld Fanatic!
Suppliers don’t make batches of bad parts over the course of four model years. It does not happen that way.
Rather, MB failed in the piston design exercise and put an inferior design into production which has in fact spanned four model years.
Piston material grade, geometry, and manufacturing process specifications are the totality of MB’s failure in this case. It’s junk engineering which results in junk products. Common knowledge in MB’s home market.
Rather, MB failed in the piston design exercise and put an inferior design into production which has in fact spanned four model years.
Piston material grade, geometry, and manufacturing process specifications are the totality of MB’s failure in this case. It’s junk engineering which results in junk products. Common knowledge in MB’s home market.
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chassis (02-03-2023)
#227
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2017 GLE350 4MATIC
Post reported as a personal attack.
#228
MBWorld Fanatic!
I responded directly to your latest broken record post that continues to attack MB on every post you make solely because of a bad personal experience you once had years ago with MB. Your posts make it obvious that you're not an engineer so you aren't able to post anything constructive to help this thread along. I have every right to continue to point this out. You're the one who continually personally attacks me for calling out your bad behavior.
#229
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2008 E350 4Matic, 2011 E350 4matic
Suppliers don’t make batches of bad parts over the course of four model years. It does not happen that way.
Rather, MB failed in the piston design exercise and put an inferior design into production which has in fact spanned four model years.
Piston material grade, geometry, and manufacturing process specifications are the totality of MB’s failure in this case. It’s junk engineering which results in junk products. Common knowledge in MB’s home market.
Rather, MB failed in the piston design exercise and put an inferior design into production which has in fact spanned four model years.
Piston material grade, geometry, and manufacturing process specifications are the totality of MB’s failure in this case. It’s junk engineering which results in junk products. Common knowledge in MB’s home market.
#230
Newbie
I responded directly to your latest broken record post that continues to attack MB on every post you make solely because of a bad personal experience you once had years ago with MB. Your posts make it obvious that you're not an engineer so you aren't able to post anything constructive to help this thread along. I have every right to continue to point this out. You're the one who continually personally attacks me for calling out your bad behavior.
#231
MBWorld Fanatic!
I'm sure you're familiar with balance shaft problem in the M272 engine. That pretty much affected all 2006 E350's and some 2007 E350's along with many other M272 engines in other cars. But there are many of them out there that didn't have the issue and the estimates range from 10-30% of the cars were affected. Judging just by the number of complaints of bad engines so far, it seems like it's even less than 10% so if it was a bad design, I think it would be affecting a lot more cars. Probably some variable quality control problem which is a common issue in manufacturing. But as usual MB isn't talking so it's really all speculation at this point without any data to back it up. But as with the balance shaft issue, nothing was really done about it, there was some small settlement but it expired and people continue to run into bad engines. In this case, an engine dying suddenly can be said to affect safety so maybe filing a complaint with the NHTSA will cause them to push MB to do something. Nothing happened with the balance shaft as the safety case wasn't really made.
#233
Cracked Piston
Hello, here’s my report o the C300 I drive, it’s a year 2015, 4Matic, Sport with AMG wheels, car looks like new, cosmetics and paint is near perfect. till this thing happened while driving, the car loses pressure and started to shake and vibrate violently, luckily I was off the freeway, this could definitely have resulted in an accident.
I took it to a local Mercedes dealership, they kept it for 2 days, and that’s when the surprise estimate repair comes, around $17k repair cost, the whole car is worth 18k. the service advisor said that there’s a broken piston after the technician did some pressure test and confirmed that cylinder 1 has about 85% leakage. I learned afterwards that this is a very common issue on this year and model and Mercedes don’t want to be responsible for it. This is all due to a defective design. So after reading this blog, I’m definitely down to join and have this class action lawsuit signed. Let me know what the next step is. I’m ready!
I took it to a local Mercedes dealership, they kept it for 2 days, and that’s when the surprise estimate repair comes, around $17k repair cost, the whole car is worth 18k. the service advisor said that there’s a broken piston after the technician did some pressure test and confirmed that cylinder 1 has about 85% leakage. I learned afterwards that this is a very common issue on this year and model and Mercedes don’t want to be responsible for it. This is all due to a defective design. So after reading this blog, I’m definitely down to join and have this class action lawsuit signed. Let me know what the next step is. I’m ready!
Last edited by Moeboss; 03-28-2023 at 12:32 AM.
#234
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2017 GLE350 4MATIC
Hello, here’s my report o the C300 I drive, it’s a year 2015, 4Matic, Sport with AMG wheels, car looks like new, cosmetics and paint is near perfect. till this thing happened while driving, the car loses pressure and started to shake and vibrate violently, luckily I was off the freeway, this could definitely have resulted in an accident.
I took it to a local Mercedes dealership, they kept it for 2 days, and that’s when the surprise estimate repair comes, around $17k repair cost, the whole car is worth 18k. the service advisor said that there’s a broken piston after the technician did some pressure test and confirmed that cylinder 1 has about 85% leakage. I learned afterwards that this is a very common issue on this year and model and Mercedes don’t want to be responsible for it. This is all due to a defective design. So after reading this blog, I’m definitely down to join and have this class action lawsuit signed. Let me know what the next step is. I’m ready!
I took it to a local Mercedes dealership, they kept it for 2 days, and that’s when the surprise estimate repair comes, around $17k repair cost, the whole car is worth 18k. the service advisor said that there’s a broken piston after the technician did some pressure test and confirmed that cylinder 1 has about 85% leakage. I learned afterwards that this is a very common issue on this year and model and Mercedes don’t want to be responsible for it. This is all due to a defective design. So after reading this blog, I’m definitely down to join and have this class action lawsuit signed. Let me know what the next step is. I’m ready!
The M274 2.0 four cylinder cannot be trusted.
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juanmor40 (03-28-2023)
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PFL205.064 with M276.823 (Oil pump solenoid defeated)
Never heard a single report of it being an issue in anywhere outside of North America, if it was an issue it would had be part of a recall in the countries you mentioned.
#238
ok, I am safe then, I have a C250 German built here in Australia, so far it has 98K and no problems. Thanks for your reply.
#239
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2008 E350 (W211 @170K), 2012 ML350 (W166 @119K), 2014 E350 (W212 @100K), 2015 ML350 (W166 @96K)
The issue is worldwide since the TSB list several models sold nearly everywhere. It does NOT differentiate manufacturing location only engine number sequence.
https://www.tsbsearch.com/Mercedes-B...03-10-P-060916
Has it happened outside of the US? What about this one:
UK:
https://forums.mercedesclub.org.uk/i...e-m274.181862/
https://forums.mercedesclub.org.uk/i...piston.189126/
Taiwan:
https://mbworld.org/forums/c-class-w...ml#post7700229
https://www.tsbsearch.com/Mercedes-B...03-10-P-060916
Has it happened outside of the US? What about this one:
UK:
https://forums.mercedesclub.org.uk/i...e-m274.181862/
https://forums.mercedesclub.org.uk/i...piston.189126/
Taiwan:
https://mbworld.org/forums/c-class-w...ml#post7700229
Last edited by juanmor40; 04-05-2023 at 11:26 AM.
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chassis (04-05-2023)
#240
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PFL205.064 with M276.823 (Oil pump solenoid defeated)
The issue is worldwide since the TSB list several models sold nearly everywhere. It does NOT differentiate manufacturing location only engine number sequence.
https://www.tsbsearch.com/Mercedes-B...03-10-P-060916
Has it happened outside of the US? What about this one:
UK:
https://forums.mercedesclub.org.uk/i...e-m274.181862/
https://forums.mercedesclub.org.uk/i...piston.189126/
Taiwan:
https://mbworld.org/forums/c-class-w...ml#post7700229
https://www.tsbsearch.com/Mercedes-B...03-10-P-060916
Has it happened outside of the US? What about this one:
UK:
https://forums.mercedesclub.org.uk/i...e-m274.181862/
https://forums.mercedesclub.org.uk/i...piston.189126/
Taiwan:
https://mbworld.org/forums/c-class-w...ml#post7700229
Last edited by W205C43PFL; 04-05-2023 at 03:10 PM.
#241
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2008 E350 (W211 @170K), 2012 ML350 (W166 @119K), 2014 E350 (W212 @100K), 2015 ML350 (W166 @96K)
The M274 is made in 3 different plants: Europe (likely Stuttgart), China, and the USA (likely the Infiniti/Nissan plant since they share the engine)
https://www.wardsauto.com/2017/merce...verything-well
I doubt Europe is using USA-made engines even for the same brand unless to refill the supply chain in case of backlog.
For interested ones:
https://www.wardsauto.com/2017/merce...verything-well
I doubt Europe is using USA-made engines even for the same brand unless to refill the supply chain in case of backlog.
For interested ones:
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Keith66 (04-06-2023)
#243
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PFL205.064 with M276.823 (Oil pump solenoid defeated)
#244
Junior Member
MB agrees to replace engine at their expense
Took a while (3 months) but MB finally agreed to repair their 2018 M274 C300 engine (Cylinder 1 failure at 13,000 km) at their expense approx. 12 hrs after I called head office in Germany and after ghosting my local dealership in Australia for weeks on end. Fortunately I did not need a car. Note, I never received a reply from Germany.
Shortly after agreeing to repair my car they advised they needed to replace the engine (also at their expense). A courtesy car was included the same day as they began their works (2 months). Not a sorry or anything of the kind when I picked it up, it did not even get the standard car wash.
What now annoys me is that what I thought was a "New Engine" is in fact just a "Long Block (in which the entire crank assembly including the cylinder head, valves, injection and much more have been completely overhauled and installed using only MB Genuine Parts), compared to a New Engine or New Basic Engine or Basic Engine or Long Block Plus. In short Long Block replacements are a “remanufactured engine” that does not get tested on the manufactures test stand before been sent to the dealership. You can learn more about that at b2bconnect.mercedes-benz.com/gb/products/remanufactured-parts/cars/engines/basic-engine
Even more annoying is that the this Long Block from the "new engine number” 454,306 provided appears to have been produced 86,479 before my failed engine “540,758" OR approx. 47,704 after MB modified their faulty wrist pins that were installed as of engines in 2015 engine number 274 920 30 406 602 on which leads me to believe this engine may have been produced in 2016-2017 ??
Someone please correct me if my understanding about the engine number is incorrect.
Anyway its now been 5 months and with 2,002 km on the engine and is already more noisey on cold starts that the original engine. Transmission also notably louder. I don’t know what to do, I just know I don’t trust this engine, or MB and I will never buy another MB again. Is it all in my head or should I flick it.
If you are interested in what a new m274 long block sounds like with 2,002 km you can download my videos at recorded on a iPhone 101a M274 2018 Cold Start 3m 30sec - 37-40 deg celsius.mov
https://www.icloud.com/iclouddrive/0...40_deg_celsius
1b M274 2018 Cold Start 35 secs - Bottom Engine Bay + SLOWMO.zip
https://www.icloud.com/iclouddrive/0...e_Bay_+_SLOWMO
1c M274 2018 Cold Start 10 secs at 50 70 80 95 96 deg celsius 4-10.zip
https://www.icloud.com/iclouddrive/0...g_celsius_4-10
No warranty was offered on the new long block as it was done under warranty.MB also returned it with a broken PVC line (crank case vent line) and a torn aftermarket pod air filter. Fortunately as soon as I drove it the 2k drive home I inspected their workmanship. Had I not caught this vent line it would not have been too long before I was back for another engine replacement.
Shortly after agreeing to repair my car they advised they needed to replace the engine (also at their expense). A courtesy car was included the same day as they began their works (2 months). Not a sorry or anything of the kind when I picked it up, it did not even get the standard car wash.
What now annoys me is that what I thought was a "New Engine" is in fact just a "Long Block (in which the entire crank assembly including the cylinder head, valves, injection and much more have been completely overhauled and installed using only MB Genuine Parts), compared to a New Engine or New Basic Engine or Basic Engine or Long Block Plus. In short Long Block replacements are a “remanufactured engine” that does not get tested on the manufactures test stand before been sent to the dealership. You can learn more about that at b2bconnect.mercedes-benz.com/gb/products/remanufactured-parts/cars/engines/basic-engine
Even more annoying is that the this Long Block from the "new engine number” 454,306 provided appears to have been produced 86,479 before my failed engine “540,758" OR approx. 47,704 after MB modified their faulty wrist pins that were installed as of engines in 2015 engine number 274 920 30 406 602 on which leads me to believe this engine may have been produced in 2016-2017 ??
Someone please correct me if my understanding about the engine number is incorrect.
Anyway its now been 5 months and with 2,002 km on the engine and is already more noisey on cold starts that the original engine. Transmission also notably louder. I don’t know what to do, I just know I don’t trust this engine, or MB and I will never buy another MB again. Is it all in my head or should I flick it.
If you are interested in what a new m274 long block sounds like with 2,002 km you can download my videos at recorded on a iPhone 101a M274 2018 Cold Start 3m 30sec - 37-40 deg celsius.mov
https://www.icloud.com/iclouddrive/0...40_deg_celsius
1b M274 2018 Cold Start 35 secs - Bottom Engine Bay + SLOWMO.zip
https://www.icloud.com/iclouddrive/0...e_Bay_+_SLOWMO
1c M274 2018 Cold Start 10 secs at 50 70 80 95 96 deg celsius 4-10.zip
https://www.icloud.com/iclouddrive/0...g_celsius_4-10
No warranty was offered on the new long block as it was done under warranty.MB also returned it with a broken PVC line (crank case vent line) and a torn aftermarket pod air filter. Fortunately as soon as I drove it the 2k drive home I inspected their workmanship. Had I not caught this vent line it would not have been too long before I was back for another engine replacement.
Last edited by davidijames; 04-07-2023 at 07:32 PM. Reason: Updated Video Recordings and ULRs
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chassis (04-07-2023)
#245
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2008 E350 (W211 @170K), 2012 ML350 (W166 @119K), 2014 E350 (W212 @100K), 2015 ML350 (W166 @96K)
Congratulations you got your car back in one working piece. I listened to the audio, and I have driven the M274 a few times (loaner vehicles) but I am not very familiar with the M274 sound (drive M272/M276 vehicles at the moment), but the sound is very reasonable for a 4-cylinder engine. Once warmed up, the sound I would say is very good. Keep in mind you are recording next to it and capturing all kinds of stuff in it: high-pressure fuel pump, injectors, etc
If worried, I would record it every few miles, say 1000 or 2000, and compare recordings until you feel settled on the issue. One thing though, assume severe driving conditions and service the vehicle more often, and use the premium gas as specified. Also, I would not red-line that engine ( I do not do that to any engine anyways ). You can always drive fast if that is your motto without red-lining it, just be patient with it (it is a sec or 2 at most)
If worried, I would record it every few miles, say 1000 or 2000, and compare recordings until you feel settled on the issue. One thing though, assume severe driving conditions and service the vehicle more often, and use the premium gas as specified. Also, I would not red-line that engine ( I do not do that to any engine anyways ). You can always drive fast if that is your motto without red-lining it, just be patient with it (it is a sec or 2 at most)
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chassis (04-07-2023)
#246
Junior Member
Congratulations you got your car back in one working piece. I listened to the audio, and I have driven the M274 a few times (loaner vehicles) but I am not very familiar with the M274 sound (drive M272/M276 vehicles at the moment), but the sound is very reasonable for a 4-cylinder engine. Once warmed up, the sound I would say is very good. Keep in mind you are recording next to it and capturing all kinds of stuff in it: high-pressure fuel pump, injectors, etc
If worried, I would record it every few miles, say 1000 or 2000, and compare recordings until you feel settled on the issue. One thing though, assume severe driving conditions and service the vehicle more often, and use the premium gas as specified. Also, I would not red-line that engine ( I do not do that to any engine anyways ). You can always drive fast if that is your motto without red-lining it, just be patient with it (it is a sec or 2 at most)
If worried, I would record it every few miles, say 1000 or 2000, and compare recordings until you feel settled on the issue. One thing though, assume severe driving conditions and service the vehicle more often, and use the premium gas as specified. Also, I would not red-line that engine ( I do not do that to any engine anyways ). You can always drive fast if that is your motto without red-lining it, just be patient with it (it is a sec or 2 at most)
Cars are made to be driven not baby'ied around and per the MB marketing materials it is advertised as a sports car, that said all gear changes are done manually via the paddleshifts at 4800- 4900 rpm sometimes 5200 rpm if pulling 3rd, 4th and 5th gears. This engine does not make much power over 4900 rpm so pointless to shift any higher.
Engine is always cooled down correctly too (driven between 3000-2000 rpm for a period of time before engine shut off and let to idel bit too, that is if I have been driving hard. In short it is not a driver issue, or poor maintenance issue its a engine issue
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chassis (04-07-2023)
#247
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I am sorry if I came across wrongly. I agree with you cars are to be driven, and I do drive mine aggressively for some people, but rather tame for others. I do not redline engine perhaps because I am an engineer and I understand the process and its quirks and do not like pay for someone else's compromises.
I meant just be careful it does not fail on you again. I am not here to protect MB by any means of the imagination.
Happy driving
I meant just be careful it does not fail on you again. I am not here to protect MB by any means of the imagination.
Happy driving
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Ghickmb (10-15-2023)
#248
Junior Member
I am sorry if I came across wrongly. I agree with you cars are to be driven, and I do drive mine aggressively for some people, but rather tame for others. I do not redline engine perhaps because I am an engineer and I understand the process and its quirks and do not like pay for someone else's compromises.
I meant just be careful it does not fail on you again. I am not here to protect MB by any means of the imagination.
Happy driving
I meant just be careful it does not fail on you again. I am not here to protect MB by any means of the imagination.
Happy driving
Maybe I will look for some forged pistons, maybe this is the solution if I want to keep this car, or just accept this car cannot be driven. I really do like the c300 but every time I want to go for a long drive or tinder date I always think is this engine going to get me home and this feeling sucks.
BTW I updated my posts with some better recordings from Top and Bottom of engine, hopefully quick to d/l too. 1a M274 2018 Cold Start 3m 30sec - 37-40 deg celsius.mov
https://www.icloud.com/iclouddrive/0...40_deg_celsius
1b M274 2018 Cold Start 35 secs - Bottom Engine Bay + SLOWMO.zip
https://www.icloud.com/iclouddrive/0...e_Bay_+_SLOWMO
1c M274 2018 Cold Start 10 secs at 50 70 80 95 96 deg celsius 4-10.zip
https://www.icloud.com/iclouddrive/0...g_celsius_4-10
The following users liked this post:
chassis (04-07-2023)
#249
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Location: Yours to Discover
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PFL205.064 with M276.823 (Oil pump solenoid defeated)
Took a while (3 months) but MB finally agreed to repair their 2018 M274 C300 engine (Cylinder 1 failure at 13,000 km) at their expense approx. 12 hrs after I called head office in Germany and after ghosting my local dealership in Australia for weeks on end. Fortunately I did not need a car. Note, I never received a reply from Germany.
Shortly after agreeing to repair my car they advised they needed to replace the engine (also at their expense). A courtesy car was included the same day as they began their works (2 months). Not a sorry or anything of the kind when I picked it up, it did not even get the standard car wash.
What now annoys me is that what I thought was a "New Engine" is in fact just a "Long Block (in which the entire crank assembly including the cylinder head, valves, injection and much more have been completely overhauled and installed using only MB Genuine Parts), compared to a New Engine or New Basic Engine or Basic Engine or Long Block Plus. In short Long Block replacements are a “remanufactured engine” that does not get tested on the manufactures test stand before been sent to the dealership. You can learn more about that at b2bconnect.mercedes-benz.com/gb/products/remanufactured-parts/cars/engines/basic-engine
Even more annoying is that the this Long Block from the "new engine number” 454,306 provided appears to have been produced 86,479 before my failed engine “540,758" OR approx. 47,704 after MB modified their faulty wrist pins that were installed as of engines in 2015 engine number 274 920 30 406 602 on which leads me to believe this engine may have been produced in 2016-2017 ??
Someone please correct me if my understanding about the engine number is incorrect.
Anyway its now been 5 months and with 2,002 km on the engine and is already more noisey on cold starts that the original engine. Transmission also notably louder. I don’t know what to do, I just know I don’t trust this engine, or MB and I will never buy another MB again. Is it all in my head or should I flick it.
If you are interested in what a new m274 long block sounds like with 2,002 km you can download my videos at recorded on a iPhone 101a M274 2018 Cold Start 3m 30sec - 37-40 deg celsius.mov
https://www.icloud.com/iclouddrive/0...40_deg_celsius
1b M274 2018 Cold Start 35 secs - Bottom Engine Bay + SLOWMO.zip
https://www.icloud.com/iclouddrive/0...e_Bay_+_SLOWMO
1c M274 2018 Cold Start 10 secs at 50 70 80 95 96 deg celsius 4-10.zip
https://www.icloud.com/iclouddrive/0...g_celsius_4-10
No warranty was offered on the new long block as it was done under warranty.MB also returned it with a broken PVC line (crank case vent line) and a torn aftermarket pod air filter. Fortunately as soon as I drove it the 2k drive home I inspected their workmanship. Had I not caught this vent line it would not have been too long before I was back for another engine replacement.
Shortly after agreeing to repair my car they advised they needed to replace the engine (also at their expense). A courtesy car was included the same day as they began their works (2 months). Not a sorry or anything of the kind when I picked it up, it did not even get the standard car wash.
What now annoys me is that what I thought was a "New Engine" is in fact just a "Long Block (in which the entire crank assembly including the cylinder head, valves, injection and much more have been completely overhauled and installed using only MB Genuine Parts), compared to a New Engine or New Basic Engine or Basic Engine or Long Block Plus. In short Long Block replacements are a “remanufactured engine” that does not get tested on the manufactures test stand before been sent to the dealership. You can learn more about that at b2bconnect.mercedes-benz.com/gb/products/remanufactured-parts/cars/engines/basic-engine
Even more annoying is that the this Long Block from the "new engine number” 454,306 provided appears to have been produced 86,479 before my failed engine “540,758" OR approx. 47,704 after MB modified their faulty wrist pins that were installed as of engines in 2015 engine number 274 920 30 406 602 on which leads me to believe this engine may have been produced in 2016-2017 ??
Someone please correct me if my understanding about the engine number is incorrect.
Anyway its now been 5 months and with 2,002 km on the engine and is already more noisey on cold starts that the original engine. Transmission also notably louder. I don’t know what to do, I just know I don’t trust this engine, or MB and I will never buy another MB again. Is it all in my head or should I flick it.
If you are interested in what a new m274 long block sounds like with 2,002 km you can download my videos at recorded on a iPhone 101a M274 2018 Cold Start 3m 30sec - 37-40 deg celsius.mov
https://www.icloud.com/iclouddrive/0...40_deg_celsius
1b M274 2018 Cold Start 35 secs - Bottom Engine Bay + SLOWMO.zip
https://www.icloud.com/iclouddrive/0...e_Bay_+_SLOWMO
1c M274 2018 Cold Start 10 secs at 50 70 80 95 96 deg celsius 4-10.zip
https://www.icloud.com/iclouddrive/0...g_celsius_4-10
No warranty was offered on the new long block as it was done under warranty.MB also returned it with a broken PVC line (crank case vent line) and a torn aftermarket pod air filter. Fortunately as soon as I drove it the 2k drive home I inspected their workmanship. Had I not caught this vent line it would not have been too long before I was back for another engine replacement.
#250
Junior Member
So I am considering swapping in some forged pistons. Will contact wossner as I think this listing should read M264 2019 -2021 not M274 2019 - 2021
https://wossnerpistons.com/products/9530
If anyone is interested below are MB part numbers for OEM pistons for the M274 and M264
M274920 Piston Part No : 274920 2740300900
Bore 83.0 mm
Stroke is 92.0 mm
Compression ratio 9.8:1
https://www.motorreviewer.com/engine.php?engine_id=176M264920 Piston Part No : Variant One - 2640302100 AND Variant Two 2640302200 (yep two versions)
Bore 83.0mm
Stroke is 92.0 mm
Compression ratio 10.5:1
https://www.motorreviewer.com/engine.php?engine_id=177
https://wossnerpistons.com/products/9530
If anyone is interested below are MB part numbers for OEM pistons for the M274 and M264
M274920 Piston Part No : 274920 2740300900
Bore 83.0 mm
Stroke is 92.0 mm
Compression ratio 9.8:1
https://www.motorreviewer.com/engine.php?engine_id=176M264920 Piston Part No : Variant One - 2640302100 AND Variant Two 2640302200 (yep two versions)
Bore 83.0mm
Stroke is 92.0 mm
Compression ratio 10.5:1
https://www.motorreviewer.com/engine.php?engine_id=177
Last edited by davidijames; 04-13-2023 at 07:30 PM. Reason: typo ready should read read