Preventative repairs/maintenance and reliability modifications
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prospective w212 buyer
Preventative repairs/maintenance and reliability modifications
What are the best preventative maintenance measures and reliable modifications I can perform to an M278 powered car to ensure it lasts as long as possible and stays reliable? I’m aware of oil leaking into the cam sensors issue. Also, I know Mercedes aren’t usually cars that people perform DIY repairs and maintenance on, but I love working on cars, so any DIY repair guides and resources you could recommend would be greatly appreciated.
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What are the best preventative maintenance measures and reliable modifications I can perform to an M278 powered car to ensure it lasts as long as possible and stays reliable? I’m aware of oil leaking into the cam sensors issue. Also, I know Mercedes aren’t usually cars that people perform DIY repairs and maintenance on, but I love working on cars, so any DIY repair guides and resources you could recommend would be greatly appreciated.
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MBWorld God!
Joined: Dec 2019
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https://mbworld.org/forums/w212-amg/...-rewiring.html
I mean, both are not the M178 but might be applicable
I mean, both are not the M178 but might be applicable
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From: Colorado
G550
5K OCIs, MB service interval compliance for all other fluids (unless use and abuse warrants more frequent service), new sparkplugs no later than 50K, and keep your tires maintained -- pressure, bal/rot, replaced when down to 1/4 tread depth, and season appropriate.
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I guess I would add probably coils? And injectors?
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prospective w212 buyer
Personally i always go with a 3k oci
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From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
STAYING AHEAD OF TROUBLES... HOW
Once the extreme heatsoaks are cancelled out with better oiling, the coils, injectors, CPS stand a chance to be near lifetime parts. 
Else you can add all coolant plastic hoses, heat exchanger, radiator, timing cover seals.
Cheap chain tensioners are good to keep in shape so they don't leak oil pressure.
Serpentine kit are like 50kMi items before belt shreds.
A big part of reliability involves electrical issues centered around low unstable voltage.
Then you'll have an unusually robust chassis. MB are really well built to be predictable.
Else you can add all coolant plastic hoses, heat exchanger, radiator, timing cover seals.
Cheap chain tensioners are good to keep in shape so they don't leak oil pressure.
Serpentine kit are like 50kMi items before belt shreds.
A big part of reliability involves electrical issues centered around low unstable voltage.
- Float battery to prevent drain
- Clean poor GND posts
- Cancel dynamic voltage swings (ALT-LIN)
- Solder marginal solderless connections
Then you'll have an unusually robust chassis. MB are really well built to be predictable.
Last edited by CaliBenzDriver; Feb 18, 2025 at 07:36 PM.
MBWorld God!
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Posts: 32,536
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Once the extreme heatsoaks are cancelled out with better oiling, the coils, injectors, CPS stand a chance to be near lifetime parts.
Else you can add all coolant plastic hoses, heat exchanger, radiator, timing cover seals.
Cheap chain tensioners are good to keep in shape so they don't leak oil pressure.
Serpentine kit are like 50kMi items before belt shreds.
A big part of reliability involves electrical issues centered around low unstable voltage.
Then you'll have an unusually robust chassis. MB are really well built to be predictable.
Else you can add all coolant plastic hoses, heat exchanger, radiator, timing cover seals.
Cheap chain tensioners are good to keep in shape so they don't leak oil pressure.
Serpentine kit are like 50kMi items before belt shreds.
A big part of reliability involves electrical issues centered around low unstable voltage.
- Float battery to prevent drain
- Clean poor GND posts
- Cancel dynamic voltage swings (ALT-LIN)
- Solder marginal solderless connections
Then you'll have an unusually robust chassis. MB are really well built to be predictable.
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From: DFW area in TEXAS! 🤠
2018 S450 4Matic, 2021 Toyota Tundra, 2010 GL350 (sold)
Once the extreme heatsoaks are cancelled out with better oiling, the coils, injectors, CPS stand a chance to be near lifetime parts.
Else you can add all coolant plastic hoses, heat exchanger, radiator, timing cover seals.
Cheap chain tensioners are good to keep in shape so they don't leak oil pressure.
Serpentine kit are like 50kMi items before belt shreds.
A big part of reliability involves electrical issues centered around low unstable voltage.
Then you'll have an unusually robust chassis. MB are really well built to be predictable.
Else you can add all coolant plastic hoses, heat exchanger, radiator, timing cover seals.
Cheap chain tensioners are good to keep in shape so they don't leak oil pressure.
Serpentine kit are like 50kMi items before belt shreds.
A big part of reliability involves electrical issues centered around low unstable voltage.
- Float battery to prevent drain
- Clean poor GND posts
- Cancel dynamic voltage swings (ALT-LIN)
- Solder marginal solderless connections
Then you'll have an unusually robust chassis. MB are really well built to be predictable.
Dummy
