Longevity of M276 Engine
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Joined: Dec 2024
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From: Richmond CA
2021 AMG GLC63S Coupe
Longevity of M276 Engine
In addition to my 2023 GLC43 V6 coupe, I also have a 2003 Acura CL-S with a 3.2Litre V6. The Acura has 275,000 miles on it and shows no sign of giving up any time soon. As far as I can tell, it the engine is as robust as it was in 2003. I have no doubt it will make to 350,000 miles if I drove that much. Honda/Acura make engines that are designed to last for many miles. MB makes engines with performance as the primary consideration. My question is, how many miles do you think an M276 V6 engine can go before major repairs are needed assuming maintenance per MB recommendations and moderate driving habits.
Last edited by jwells222; Mar 8, 2025 at 09:17 PM.
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In addition to my 2023 GLC43 V6 coupe, I also have a 2003 Acura CL-S with a 3.2Litre V6. The Acura has 275,000 miles on it and shows no sign of giving up any time soon. As far as I can tell, it the engine is as robust as it was in 2003. I have no doubt it will make to 350,000 miles if I drove that much. Honda/Acura make engines that are designed to last for many miles. MB makes engines with performance as the primary consideration. My question is, how many miles do you think an M276 V6 engine can go before major repairs are needed assuming maintenance per MB recommendations and moderate driving habits.
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Those are off the top of my head I might had missed many things though.
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Forgot to mention: Other obvious things like windshield wipers that are also wear and tear
Forum member @chassis wrote a nice DIY guide with various wear and tear items: https://mbworld.org/forums/gle-class...ispreloading=1
Hopefully forum member chassis can include the things I missed.
Forum member @chassis wrote a nice DIY guide with various wear and tear items: https://mbworld.org/forums/gle-class...ispreloading=1
Hopefully forum member chassis can include the things I missed.
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Joined: Dec 2024
Posts: 114
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From: Richmond CA
2021 AMG GLC63S Coupe
Above and beyond what MB includes on those A and B schedules, this is what I've pieced together with the help of the service department:
Spark plug replacement Every 50 or 5 Years
ATF drain and fill with new filter Every 60 or 6 Years
Front Differential case drain and fill No scheduled interval, but every 60 or 6 Years is
advisable
Rear Differential case drain and fill Every 30 or 3 Years
Transfer case drain and fill Every 50 or 5 Years
Steering fluid drain and fill N/A - Electronic fly by wire steering so no fluid
Engine air filter Every 50 or 5 Years
Replace fuel filter Every 120 or 12 Years
Coolant drain and fill Every 120 or 12 Years
(main circuit and low temperature circuit)
Spark plug replacement Every 50 or 5 Years
ATF drain and fill with new filter Every 60 or 6 Years
Front Differential case drain and fill No scheduled interval, but every 60 or 6 Years is
advisable
Rear Differential case drain and fill Every 30 or 3 Years
Transfer case drain and fill Every 50 or 5 Years
Steering fluid drain and fill N/A - Electronic fly by wire steering so no fluid
Engine air filter Every 50 or 5 Years
Replace fuel filter Every 120 or 12 Years
Coolant drain and fill Every 120 or 12 Years
(main circuit and low temperature circuit)
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Above and beyond what MB includes on those A and B schedules, this is what I've pieced together with the help of the service department:
Spark plug replacement Every 50 or 5 Years
ATF drain and fill with new filter Every 60 or 6 Years
Front Differential case drain and fill No scheduled interval, but every 60 or 6 Years is
advisable
Rear Differential case drain and fill Every 30 or 3 Years
Transfer case drain and fill Every 50 or 5 Years
Steering fluid drain and fill N/A - Electronic fly by wire steering so no fluid
Engine air filter Every 50 or 5 Years
Replace fuel filter Every 120 or 12 Years
Coolant drain and fill Every 120 or 12 Years
(main circuit and low temperature circuit)
Spark plug replacement Every 50 or 5 Years
ATF drain and fill with new filter Every 60 or 6 Years
Front Differential case drain and fill No scheduled interval, but every 60 or 6 Years is
advisable
Rear Differential case drain and fill Every 30 or 3 Years
Transfer case drain and fill Every 50 or 5 Years
Steering fluid drain and fill N/A - Electronic fly by wire steering so no fluid
Engine air filter Every 50 or 5 Years
Replace fuel filter Every 120 or 12 Years
Coolant drain and fill Every 120 or 12 Years
(main circuit and low temperature circuit)
I have a 2017 C 43 with the same engine, I am planning to keep it for a very long time. Even if I get a new car (I was considering a CLE 53), I will still keep this one alongside. I am very satisfied with how it doesn't have a complicated drivetrain, mild-hybrid, plug-in hybrid, hybrid. The M276 is an overall great package.
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I want to bring your attention to this mod though, it is experimental but proven to have benefits: https://mbworld.org/forums/c450-c43-...-oil-flow.html
I already did the mod: https://mbworld.org/forums/w212-amg/...ml#post8963720 (you should read the first page's frequently asked questions).
I already did the mod: https://mbworld.org/forums/w212-amg/...ml#post8963720 (you should read the first page's frequently asked questions).
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Here is another experimental mod I also did: https://mbworld.org/forums/mercedes-...s-voltage.html
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From: unbegrenzt
2017 GLE350 4MATIC
The M276 is the most reliable MB engine in at least 20 years, in both configurations of 3.5NA and 3.0TT.
Staying ahead of all maintenance is required. Early spark plug, engine air filter and oil changes are advised. I change oil on my Cayenne every 5k-6k miles using a cheap store brand oil filter and my Blackstone results are excellent.
Replace ignition coils every 50k miles.
Inspect the engine bay and underbody regularly for signs of leaks.
MB transmissions depend on oil change at the specified interval.
In summary, do the maintenance.
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From: SF BAY AREA
C400
I have a 2015 C400 at the cusp of 200K miles. I've had the camshaft adjuster issue for the past 2 years (sometimes it makes the noise sometimes it doesn't). The adjusters have been the biggest issues I've had with the car. I've replaced motor mounts (break stance so my fault), transmission mount at the same time as motor mounts, front control arms (I had K-Macs, never worked had to replace, again my fault). The radiator and alternator were replace last year, other then that I've had maintenance items only, I change my oil every 5K miles and use Liqui Moly, with MB filter and add ceramic Liqui Molly protection at oil change.
I feel, if I would have left my car stock, I wouldn't have had so many issues but most likely not been able to avoid the camshaft adjuster issue. At this point, I'm undecided of fixing the adjuster issue or getting rid of the car. I just got the GLC63 (do not want to use as a daily), so to replace the C400 I would get another used vehicle that I do not know the ins and outs of. The C400 is still fast! If I line up against a newer C450/C43, it makes for a very interesting race and I'm only Stage 1. I can only imagine what it would do once everything is freshened up!
I feel, if I would have left my car stock, I wouldn't have had so many issues but most likely not been able to avoid the camshaft adjuster issue. At this point, I'm undecided of fixing the adjuster issue or getting rid of the car. I just got the GLC63 (do not want to use as a daily), so to replace the C400 I would get another used vehicle that I do not know the ins and outs of. The C400 is still fast! If I line up against a newer C450/C43, it makes for a very interesting race and I'm only Stage 1. I can only imagine what it would do once everything is freshened up!
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I have a 2015 C400 at the cusp of 200K miles. I've had the camshaft adjuster issue for the past 2 years (sometimes it makes the noise sometimes it doesn't). The adjusters have been the biggest issues I've had with the car. I've replaced motor mounts (break stance so my fault), transmission mount at the same time as motor mounts, front control arms (I had K-Macs, never worked had to replace, again my fault). The radiator and alternator were replace last year, other then that I've had maintenance items only, I change my oil every 5K miles and use Liqui Moly, with MB filter and add ceramic Liqui Molly protection at oil change.
I feel, if I would have left my car stock, I wouldn't have had so many issues but most likely not been able to avoid the camshaft adjuster issue. At this point, I'm undecided of fixing the adjuster issue or getting rid of the car. I just got the GLC63 (do not want to use as a daily), so to replace the C400 I would get another used vehicle that I do not know the ins and outs of. The C400 is still fast! If I line up against a newer C450/C43, it makes for a very interesting race and I'm only Stage 1. I can only imagine what it would do once everything is freshened up!
I feel, if I would have left my car stock, I wouldn't have had so many issues but most likely not been able to avoid the camshaft adjuster issue. At this point, I'm undecided of fixing the adjuster issue or getting rid of the car. I just got the GLC63 (do not want to use as a daily), so to replace the C400 I would get another used vehicle that I do not know the ins and outs of. The C400 is still fast! If I line up against a newer C450/C43, it makes for a very interesting race and I'm only Stage 1. I can only imagine what it would do once everything is freshened up!
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Senior Member
Joined: Jan 2018
Posts: 293
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From: SF BAY AREA
C400
Thank you for the link W205C43PFL
Last edited by CA400; Mar 10, 2025 at 04:55 PM. Reason: added comment
MBWorld God!
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MBWorld God!
Joined: Dec 2019
Posts: 32,231
Likes: 6,284
I know I can report to MB and get some sort of emblem for the grill, may look more into that!
Thank you for the link W205C43PFL
Thank you for the link W205C43PFL
