15w-50 is the only M1 that should be in a OM61x or OM601/2/3. Except
in extreme cold. (under -10ºF) you can use a 10w 30 or 10W40. All the
others have too low zinc, and You would be better of running Delo or
Delvac dino oil with a more frequent change.
Mitch Haley via Mercedes wrote on 8/5/19 8:27 PM:
5w30 is about 12cSt at 100C.
15W50 is 18 cSt.
5W40 is 14.5 cSt.
The only difference I'd expect to see is that the 15W50 will peg the oil gauge
at idle in slightly worn engines.
One thing to consider is the loss of certain valve and rocker protecting
additives with oils formulated for modern engines. The 15W50 has more
phosphorus and zinc in it than any of the other non racing / non motorcycle
formulas of M1.
https://mobiloil.com/en/motor-oils/mobil-1/mobil-1
On August 5, 2019 at 9:08 PM Dwight Giles via Mercedes <mercedes@okiebenz.com>
wrote:
I used 15w50 in my 240D & 300D 2.5t when i was using them for hard
commuting. Is the15w50 too high a viscosity for the around town driving i
do with the CD now that it has antique plates & little driving?
Dwight Giles Jr.
Wickford RI
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