2020CClass

Hello,

I have a 2020 C Class and I was planning on keeping the car but now I am worried about the piston crack issues the models before 2019 are having (M270/M274 engines).

My question is, has it been confirmed anywhere that this issue has been fixed? I read somewhere here that one person with a 2018 that had this issue so clearly they havent fixed it yet, but for 2019+ has the issue been fixed?

I cant find any info on this anywhere. Does anyone have a contact at Mercedes Engineering that could confirm anything. Has anyone heard of any 2019+ going into dealership for cylinder crack?

The engine from 2019+ are M264 and mine is specifically M264 E20 DEH LA. These are the successors of the M27x but did they address the issue?

I am debating if I should keep the car outside of warranty. Not ready to drop 12k CAD on a cylinder issue.

190Efan

I don't know the answer to the first part of your question but based on the reports at this website, I would be very reluctant to keep the car past the warranty expiration date unless more information becomes available as to which cars are at risk and if a fix has finally been created.

2020CClass

I dont understand how this is not a big deal. A 50k car should not be expected to have the engine break down at 60kmiles...

If they know what is causing the problem, they need to do a recall. If not, they need to repair for free EVERY TIME this issue occurs, warranty or not.

How can we make this more public so they feel pressured? 95% of the customers buying this dont know. If they knew, trust me, nobody would be buying a ticking time bomb!

dwpc

I wonder if the engine source has any bearing on piston failure. My Cabriolet, including the engine, is German-built in Bremen. Alabama-made C300s get engines made by Nissan in Tennessee.

2020CClass

I dont think it matters where it's made since in the other thread I think some were from Germany. Not sure, someone could confirm.

GreekUPS

How many cars have had this problem? Not many compared to how many they've sold. I agree that these cars shouldn't be breaking at 60K miles but it might just be a few bad apples here and there.

190Efan

I think people who are having the problem need to start reporting it to NHTSA. I think that's the only way MB will finally address the problem. A $50,000 car should not be having such an early failure.

dwpc

I think the greater issue is M-B's reported non-support when a catastrophic engine failure occurs after the warranty expires but with relatively low miles. There no excuse for any engine, let alone a M-B engine, to effectively self-destruct under normal use and maintenance.

Andy74

I live in Beirut, Lebanon. I am a member of a local MB fan club called Benz Riders. The one single dealer we have imports his cars from Germany. Mine is German-built. All the guys i know in the club have German-built W205s. I never heard anyone talking or mentioning this issue.

2020CClass

There was a service bulletin for the 2015s that included German built as well, so you're wrong
they supposedly fixed the issue after april 2015 but I read ppl still have the issue

1987C1

I wonder what fuel type people are using that are having piston issues? I would think running lower octane in hot conditions could cause failures.

Andy74

​​​​​​I am not an expert in service bulletins. We have almost 650 w205 cars in the club. All German built we report incidents in group meetings we share issues and solutions to problems. I never heard of anyone talking about pistons cracking.

benzdude

Why would this still be an issue with a brand new 2020 C Class?

1987C1

Not sure it's an issue with 2019+.
????
And I have only seen one 2017+ issue on this forum I think.
So far have had 0 problems with my 2018 German built wagon.....has been a great car!

Andy74

Mine is a 2015 German built. 0 problems. Only replaced my auxillary battery, main battery and brake pads. Great car indeed.

r3dbenz89

For a while, Mercedes had been sending Tennessee built M264's to their German plant in Bremen for C Coupes and C Verts. Seems like the 21 My Coupes and Verts are getting German made engines again. As well, all US bound S. African built W205 C300's still have US built M264's. The GLE350's mill is also sourced from Tennessee.` Since the M264 is in so many models, I would think we would have heard about piston cracking by now. You can run your vin number and determine where your engine and transmission were built based upon the serialized numbers.

Mercedes Engine Code
EX: M264920- 30 - 000010
(Engine Name/Version - Plant Code - Serialized number)

MXXXXXX- N0 - XXXXXX - Manheim (hand built 12 Cylinder AMG engines)
M276XXX- E0 - XXXXXX - Dercherd Alabama USA
MXXXXXX- 30 - XXXXXX - Untertürkheim/ Bad Canstatt
MXXXXXX- 60 - XXXXXX - Affalterbach
MXXXXXX- 80 - XXXXXX - Kölleda Mdc Power

Merceds Transmission Code
EX: 725008- 01 - 000010
(Transmission Name/Version - Plant Code - Serialized Number)

XXXXXX- 01 - XXXXXX - Hedelfingen, Germany
XXXXXX- 20 - XXXXXX - Sebes, Romania

Once the serialized number reaches 999,999 the plant code rolls over to the next digit. I.e., 30 for Untertürkheim becomes 31 - 000001. Same applies to transmissions. On US bound Marooney lables, the listed transmission may list a German sourced transmission for Romanian built trannys because the vast majority of the value of the parts are from Germany and trannys are mostly only assembled in Romania.

NailsByHoney

I have a 2017 C300. Same thing happened to my car.

mallamabu

I have a 2016 c.class that from the details says built in Manhiem, Germany on 04-05-2016 and delivered to the U.S from Manhiem , Germany on 4-29-2016. Does this mean my c.class 300 (w205) was actually built WHOLE in Germany and delivered to the U.S Plant.

Also, are there any difference between the German made engines and the ones manufactures in Alabama

Can anyone kindly clarify this???

Thank you

mallamabu

In addition are the c.class (w205) built and shipped from Manhiem, Germany to the U.S any better in quality any better than the ones built in the U.S. And are they void of all the piston issues that was an issue with the earlier produced 2015 w205 engines produced in the U.S

r3dbenz89

Mercedes never built 4 cylinder engines in Manheim, only V12 engines for the upper class cars. Recheck your engine code as it was most likely built in Unterturkheim as it is an early built engine. Regardless, all early W205 sedans for the US market were built in Alabama. Very early cars had German sourced engines but eventually the Infiniti (Nissan) Dercherd, TN plant come on line and started producing M274 and later M264 engines. Starting around the 19 MY, the US started receiving some S. African built W205's until Daimler decided to cease all C Class production in the US in 2020. Now all come S. Africa. The US never received German built W205 sedans.

Mikesmith2939

I wonder if it's to do with the fuel.

I've not heard of any issues with pistons in the UK.

chassis

M274 piston failures on this site are reported on C300 (well documented) and also W213 E300: https://mbworld.org/forums/e-class-w...ml#post8246209

Where are E300 M274 engines assembled?

The GLC300 also uses the M274 engine.

The M264 shares many components with the M274, notably the crankshaft and connecting rods. However, the piston part number is new for M264. Whether it is a modification of the previous M274 design or a clean sheet new piston design, is unknown.

GreekUPS

Its very rare thats why.

hks

Doing my second rebuild now. I’m starting to wonder if I should get rid of this car when completed. Btw this is a 2017 with just 20k on the dash.

LILBENZ230