S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600

M278 engine , reliability and issues experienced?

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Old Dec 7, 2022 | 07:02 PM
  #26  
Jason B's Avatar
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W140 Mercedes S350, W221 S550 sport
I'm in love with the 2007-2011 5.5L N/A V8 sound. It's one of the main reasons I'll never sell this car. No issues with it and killer sound. Just another viewpoint.
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Old Dec 7, 2022 | 08:33 PM
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1983 Nissan Shltbox
M278 is bulletproof. Literally millions of them still on the road from 10 years ago. It's the owners that are unreliable.
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Old Dec 7, 2022 | 08:35 PM
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Originally Posted by Senecat
M278 is bulletproof. Literally millions of them still on the road from 10 years ago. It's the owners that are unreliable.
Being a Mercedes tech for the last 10 years, I can’t trust a 278, without a very good extended warranty.
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Old Dec 9, 2022 | 02:51 AM
  #29  
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An engine generation that lasted a decade and beyond, and people avoid it? I'm just not seeing the logic.
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Old Dec 9, 2022 | 02:52 AM
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Originally Posted by eurochargedw210
Being a Mercedes tech for the last 10 years, I can’t trust a 278, without a very good extended warranty.
Must have gotten all the ones with $***ty owners that didn't care about them Lol
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Old Jan 30, 2025 | 10:03 PM
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E350 CGi BlueEfficiency Coupé C207 2010; ML350 W166 Bluetec 2014
So accurate!

Originally Posted by Neuschwanstein
07-2012 S550 here, German car with full MB History. Tensioners swapped according to TSB, 80'km down in 10 years. Everything is spotless and no oil leaks whatsoever, even camshaft sensors look fine and thus the harness.
I for myself think of it like "no worries until the magic 200'km mark" and if everything should be fine beyond this, then okay. Nevertheless we will have 2035 until i reach this mileage in kilometers and if political factors progress as they do, you will either have a diamond of a car worth overhauling the engine or a world where billionaires will be the only ones left able to maintain or fuel the car.
I exactly got the car in mid 2021 to experience what it is until the world has turned fully anti-combustion so you should think about getting a decent one and make up your mind when to drive it. As a daily for getting your errands and groceries, no way at least here in Germany. I rather take it as a dream transport solution once a week when goind to the office and back, 120 miles including german Autobahn.
And if that dream should be over in 10 years than i am a blessed man.
Hope you can get what i am trying to say. Get a jetta if you need an everyday allrounder (i do like jettas, please get me right, an S550 is a rare privilege getting even more so as times are a changing).

I agree entirely. We only have a few year left to enjoy and experience this...
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