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M178 engine - break in period required?

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by E63S, Sep 12, 2017.

  1. E63S

    E63S Member

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    Your Mercedes:
    E63S W213
    I have ordered a new car with the M178 engine, as my first ever Mercedes. What are the general thoughts on breaking/running it in?

    A quick google search shows two schools of thought on Mercedes engines, running it in for 1,000 miles, 4.5k rpm max, 85mph max, and lots of engine braking, or alternatively, giving it the full beans from day 1. Unfortunately I couldn't find any specific guidance on this engine.

    Any help would be appreciated.
     
  2. Wighty

    Wighty Senior Member

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    Your Mercedes:
    W211/E320cdi/2009 and CLK200k 2009
    If I was lucky enough to have one , I would do the first 1k easy if I planned to keep the car long term . Otherwise full beans from the forecourt with the traction off :D:D:D:eek:
     
  3. malcolm210

    malcolm210 Senior Member

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    The engine is hand built so I would expect the tolerances to be as good as it gets, bearing this in mind I wouldn't red line it before 1k miles but other than that it should be good to go
     
  4. LostKiwi

    LostKiwi Senior Member

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    Your Mercedes:
    '93 500SL-32, '01 W210 Estate E240, 04 Smart Roadster Coupe
    What does it say in the owners manual?

    Personally I would drive it like you would normally only avoiding high throttle openings (hot spots the rings) and full redline runs.

    Drive it too gently and you risk glazing the bores, to hard and you introduce weaknesses into the rings.

    Full throttle from the outset is fine for race or competition engines which are regularly rebuilt but not road engines.
     
  5. daveenty

    daveenty Senior Member

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    Your Mercedes:
    2017 W213 E63s & 1989 W201 2.5-16
    There's a sticker on the windscreen advising the correct running in procedure which I would loosely stay with.

    Personally, I tend to take it easy for the first few hundred miles but varying the engine speed accordingly up to the recommended rev limit. The most important one to me is not to let it labour in a high gear at low revs.

    Also worth bearing in mind is that it's not just the engine you're bedding in, also the driveline including diffs and transmission, brakes and bearings throughout the car.

    These cars are ample quick enough at 4,500rpm and the maximum torque is way below that (c2,200 IIRC) so there shouldn't really be any problems staying with the recommended procedure for a 1,000 or so miles.

    Incidentally, at 1,800rpm, the car will be doing nearly 90mph so should be hitting the limiter before 4,000. :)

    Oh, I think it's a M177 engine, the M178 being the dry sump version as used in the GTS, though not 100%
     
    AMGeed likes this.
  6. OP
    E63S

    E63S Member

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    Thanks for all the responses. I think I'll take it easy for the first 1,000 metres, then reassess. ;)
     
  7. LostKiwi

    LostKiwi Senior Member

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    1000 metres....?
     
    daveenty likes this.

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