PeachParts Mercedes-Benz Forum - View Single Post

JHZR2 · #24 01-21-2004, 07:03 AM

I stated this evidence from the info given by gsxr of the OM603 engines develloping valve lifter noise. I do not have UOA to back it up, but all things considered,if youre having easy starts with 15w-50, and changing to 0w-40 does nothing by make noise, the 15w- is probably a better oil for your piece of mind (although the GM 4.3 and other engines can have valve ticking at startup for the same reason, for 100k miles and still be running like day 1).

Thus my statement.

Have you figured what is the burn rate of this oil? I am curious about this for my own usage, I just wonder about big tolerances on a cold engine being protected with a thin oil. Granted, by 40C, the oil is pretty thick, speaking volumes about the quality of this oil.

BTW, the typical profile of the M1 0w-40 oil from UOAs that Ive seen is that itll start out at a 40 wt, and in 5k or so miles, it will have sheared down to a slightly thinner 30wt oil. As time goes by, it will actually re-thicken slightly, so it does indeed stay in grade over a length of 10k miles or so (a requirement for the mb 229.x series specs).

JMH