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I just did a oil change yesterday and used Motul 8100 X-Clean which is 5W40 but is MB-Approval 229.51.
Also did the diff with Motul Gear Competition 75W140.
You may be already be aware, but 229.51 is not 229.5, which is only spec for M156.
So what is the milage of the car now?
And another question is, i have heard switching from the 0w40 to 5w40 masks the weird sound you get upon startup. Is this true?