2021 AMG GT63 cylinder scarring- WTH?
10-31-2023, 09:51 AM
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2021 AMG GT63 cylinder scarring- WTH?
My 2 year old GT63 has been giving me a but of issues with oil consumption in the last 1800 miles. It's burned through 4 quarts. Through 10.8K miles, the motor was tight. Total mileage now is 12.5K.
https://mbworld.org/forums/sedan/871...3-low-oil.html
Last week, I had it into the dealer who set it up for an oil consumption test. I picked up the car and ran some errands around town. About 20 miles after picking it up. The check engine light popped on and the car started running rough. When ever I'd give it gas, the steering wheel and accelerator would give shuddering feedback. I drove home immediately and I took it back in the next morning as I didnt want to sit with it rush hour traffic. They've been working on it for two days, and I got a message last night that they ended up borescoping the cylinders and found one that had scarring.
Two questions:
1. What could cause something like that?
2. How do they fix it?
Currently waiting on MB to get back the case they have open on the car. The car is pristine, engine broken in to the letter, always serviced, never tracked or modified.
https://mbworld.org/forums/sedan/871...3-low-oil.html
Last week, I had it into the dealer who set it up for an oil consumption test. I picked up the car and ran some errands around town. About 20 miles after picking it up. The check engine light popped on and the car started running rough. When ever I'd give it gas, the steering wheel and accelerator would give shuddering feedback. I drove home immediately and I took it back in the next morning as I didnt want to sit with it rush hour traffic. They've been working on it for two days, and I got a message last night that they ended up borescoping the cylinders and found one that had scarring.
Two questions:
1. What could cause something like that?
2. How do they fix it?
Currently waiting on MB to get back the case they have open on the car. The car is pristine, engine broken in to the letter, always serviced, never tracked or modified.
Last edited by Shoulders; 10-31-2023 at 10:10 AM.
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chassis (10-31-2023)
10-31-2023, 01:52 PM
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MY'14 W212 M276 3.5NA @55kMi
12kMi engine... premature failure
My 2 year old GT63 has been giving me a but of issues with oil consumption in the last 1800 miles. It's burned through 4 quarts. Through 10.8K miles, the motor was tight. Total mileage now is 12.5K.
https://mbworld.org/forums/sedan/871...3-low-oil.html
Last week, I had it into the dealer who set it up for an oil consumption test. I picked up the car and ran some errands around town. About 20 miles after picking it up. The check engine light popped on and the car started running rough. When ever I'd give it gas, the steering wheel and accelerator would give shuddering feedback. I drove home immediately and I took it back in the next morning as I didnt want to sit with it rush hour traffic. They've been working on it for two days, and I got a message last night that they ended up borescoping the cylinders and found one that had scarring.
Two questions:
1. What could cause something like that?
2. How do they fix it?
Currently waiting on MB to get back the case they have open on the car.
The car is pristine, engine broken in to the letter, always serviced, never tracked or modified.
https://mbworld.org/forums/sedan/871...3-low-oil.html
Last week, I had it into the dealer who set it up for an oil consumption test. I picked up the car and ran some errands around town. About 20 miles after picking it up. The check engine light popped on and the car started running rough. When ever I'd give it gas, the steering wheel and accelerator would give shuddering feedback. I drove home immediately and I took it back in the next morning as I didnt want to sit with it rush hour traffic. They've been working on it for two days, and I got a message last night that they ended up borescoping the cylinders and found one that had scarring.
Two questions:
1. What could cause something like that?
2. How do they fix it?
Currently waiting on MB to get back the case they have open on the car.
The car is pristine, engine broken in to the letter, always serviced, never tracked or modified.
Your local independent Mercedes dealer will handle service very professionally. They will carefully focus on all the cylinders found damaged to restore performance.
> Root cause :
The root cause of your engine damage is the
The engine computer manages a dual pressure pump for better fuel economy. This logic is coded in the Bosch ECU firmware to activate a solenoid that toggles pump high/low pressure.
> Can do vs. can't do:
I don't think Mercedes is ready to temper with your ECU under warranty nor acknowledge the mismanaged oil pressure is the culprit.
This would be a multi-billion Dollars "diesel-gate recall" all over again on the basis of Bosch software wasting engines worldwide. A quick ECU flash is all that's needed ✌️
Be prepared for cracked pistons to develop because they are not spray cooled by oil squirters under low pressure. @chassis is very familiar with cases of engines cracking pistons.
Buyback is a great option now that you understand what you know. Other options are available that will surely void any warranty coverage.
For everyone else true MIRACLES do happen like in this thread here: engine got self-fixed!.... We discuss how to do same on your own.
Eventually awesome @BenzNinja could code a remote fix for a small fee.
Keep hope alive right?
Last edited by CaliBenzDriver; 10-31-2023 at 05:11 PM.
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BenzNinja (10-31-2023)
10-31-2023, 02:34 PM
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Sorry to hear about the new AMG engine problems.
MB poor manufacturing quality, poor design and cost cutting. These are the root causes. A bit more detail is that, evidently from your description, the cylinder wall lining has failed, allowing a hardness mismatch between the cylinder and piston. The softer of the two surfaces will rapidly wear. Evidently in your case this is the cylinder wall. Not uncommon with the predecessor M278 5.5LV8 cold vee engine, but so far not as common with your M177 4.0LV8 hot vee engine.
It can't be fixed. The solutions are a new engine or sleeved cylinders. I agree with the @CaliBenzDriver to pursue a buyback. If MB replaces the engine, the new engine would have at least the same likelihood of scoring as your engine did/does.
MB poor manufacturing quality, poor design and cost cutting. These are the root causes. A bit more detail is that, evidently from your description, the cylinder wall lining has failed, allowing a hardness mismatch between the cylinder and piston. The softer of the two surfaces will rapidly wear. Evidently in your case this is the cylinder wall. Not uncommon with the predecessor M278 5.5LV8 cold vee engine, but so far not as common with your M177 4.0LV8 hot vee engine.
It can't be fixed. The solutions are a new engine or sleeved cylinders. I agree with the @CaliBenzDriver to pursue a buyback. If MB replaces the engine, the new engine would have at least the same likelihood of scoring as your engine did/does.
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CaliBenzDriver (10-31-2023)
11-02-2023, 02:55 PM
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2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Or new heads and maybe pistons...
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chassis (12-12-2023)
11-02-2023, 08:04 PM
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MY'14 W212 M276 3.5NA @55kMi
.... WHY???
I can't believe Mercedes is in search of fuel savings on TwinTurbo V8 engines by underdriving the oil pump...
Are they just seeding bad wrap about their engines to force us into the electric transition ?
Are they just seeding bad wrap about their engines to force us into the electric transition ?
Last edited by CaliBenzDriver; 11-02-2023 at 08:55 PM.
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chassis (12-12-2023)
12-12-2023, 02:30 PM
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So for those of you following at home, or not.
I picked the beast up today after 7 weeks at the dealer. The entire engine was replaced under warranty.
Cylinders #6 and #8 were scored, with #8 being the worst. Misfires, failed compression tests, etc.
I picked the beast up today after 7 weeks at the dealer. The entire engine was replaced under warranty.
Cylinders #6 and #8 were scored, with #8 being the worst. Misfires, failed compression tests, etc.
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chassis (12-12-2023)
12-12-2023, 02:48 PM
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Good thing this happened under warranty. Hopefully the new engine isn't another lemon. They did have recent quality issues with the M177 and they skipped an entire model year here in the USA because of it (2022 if I remember correctly). For future reference, oil consumption is a bad sign. These engines are not known to consume oil. I haven't had to top off a single time in the last almost 5 years now. So don't drive around for 10k miles if you start seeing oil consumption. Something is wrong if that happens.
Last edited by superswiss; 12-12-2023 at 03:24 PM.
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chassis (12-12-2023)
Trending Topics
12-12-2023, 06:21 PM
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If you haven't read through this thread, you really need to. Then decide what you want to do.
https://mbworld.org/forums/mercedes-...ification.html
https://mbworld.org/forums/mercedes-...ification.html
12-12-2023, 06:54 PM
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First confirmed example of M17x bore scoring. Keep an eye out.
The list of concerns for long-term ownership of this engine is growing. Misfire/ECU programming, oil-vapor separators/RMS failure, bore scoring.
The list of concerns for long-term ownership of this engine is growing. Misfire/ECU programming, oil-vapor separators/RMS failure, bore scoring.
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CaliBenzDriver (12-12-2023)
12-12-2023, 07:13 PM
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On second thought, I think I'll go for another Escalade
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chassis (12-13-2023)
12-12-2023, 07:15 PM
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MY'14 W212 M276 3.5NA @55kMi
MISFIRING THING IS...
"MISFIRES" are actually cylinder imbalance where ECU picks on weak contributions by matching the crank speed variation vs. what cylinder is currently firing.
It can be burned coil/injector but lately "MISFIRING" references overheated pistons + bore score from marginal control of oil pump by ECU.
It can be burned coil/injector but lately "MISFIRING" references overheated pistons + bore score from marginal control of oil pump by ECU.
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Shoulders (12-12-2023)
12-12-2023, 07:39 PM
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It's going to be one heck of a CarFax to the future owner:
200 Miles - Battery Replaced
6000 Miles - Oil Changed
11300 Miles - Oil Changed, leak inspection performed
12400 Miles - Engine checked, oil consumption checked
12500 Miles - Engine replaced
200 Miles - Battery Replaced
6000 Miles - Oil Changed
11300 Miles - Oil Changed, leak inspection performed
12400 Miles - Engine checked, oil consumption checked
12500 Miles - Engine replaced
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chassis (12-13-2023)
12-19-2023, 07:23 PM
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12580 Miles - Water pump replaced
Mechanically it's coming close to my ill-fated Jaguar XJ, which I owned for a mere 13 months before the incessant electrical problems made me throw in the trade-in towel.
I love this car, I really do. Might be time to burn some sage or a spliff in it.
I would also add. I am getting to know to the dealers loaner fleet well. What I am noticing in the loaners, a GLA AMG and now EQS AMG, have random rattles. It's not a genuine affront to me as I don't own them, but I am wondering if the fit quality has gone down the toilet? My first MB was '04 E and was a tank, the two CLS550s I had after it (one of which I still have and is the driven by my teen boys) were always/still tight. I suppose this is what happens when CPAs and MBAs run businesses.
Last edited by Shoulders; 12-19-2023 at 08:18 PM.
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juanmor40 (12-20-2023)
03-10-2024, 07:02 PM
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repair options
Sorry to hear about the new AMG engine problems.
MB poor manufacturing quality, poor design and cost cutting. These are the root causes. A bit more detail is that, evidently from your description, the cylinder wall lining has failed, allowing a hardness mismatch between the cylinder and piston. The softer of the two surfaces will rapidly wear. Evidently in your case this is the cylinder wall. Not uncommon with the predecessor M278 5.5LV8 cold vee engine, but so far not as common with your M177 4.0LV8 hot vee engine.
It can't be fixed. The solutions are a new engine or sleeved cylinders. I agree with the @CaliBenzDriver to pursue a buyback. If MB replaces the engine, the new engine would have at least the same likelihood of scoring as your engine did/does.
MB poor manufacturing quality, poor design and cost cutting. These are the root causes. A bit more detail is that, evidently from your description, the cylinder wall lining has failed, allowing a hardness mismatch between the cylinder and piston. The softer of the two surfaces will rapidly wear. Evidently in your case this is the cylinder wall. Not uncommon with the predecessor M278 5.5LV8 cold vee engine, but so far not as common with your M177 4.0LV8 hot vee engine.
It can't be fixed. The solutions are a new engine or sleeved cylinders. I agree with the @CaliBenzDriver to pursue a buyback. If MB replaces the engine, the new engine would have at least the same likelihood of scoring as your engine did/does.
The following users liked this post:
chassis (03-10-2024)
03-10-2024, 07:43 PM
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2023 EQE 500 SUV electric and 2024 Jaguar F-PACE SVR 5.0L
I got a recall notice for a 2.0L Atkinson cycle motor in a Hyundai that was manufactured with piston rings that were too hard. Sheet happens.. I traded it while they were "working on a solution" (trying to figure out how to weasel out of giving me a new motor). https://static.nhtsa.gov/odi/rcl/202...1V301-5966.pdf
