I don't think I've ever seen M1 20w50... I forget where you are but if the
car starts okay at your temps then I'd suggest its fine. A 61x will never be
able to go long OCI due to soot levels unless you filter for soot specifically
which probably isn't worth it on a car not being driven big miles. The last
240D I had I used M1 15w50 in the summer and M1 5w40 in the winter. The 240D
before that leaked oil really bad so it got the cheapest 15w40 I could find but
got changed at 3,000 miles or so...
-Curt
On Monday, March 18, 2019, 1:31:36 PM EDT, Allan Streib via Mercedes
<mercedes@okiebenz.com> wrote:
Wow an oil thread.
What are people using in the older diesels, e.g. OM617?
Years ago (Marshall Booth era) I used to use M1 20W50. I later got the
impression that it wasn't so great for diesels anymore, and started
using Delo and changing more often.
I have M1 20W50 in the 300SD now, mainly because I had about 10 quarts
sitting in the garage last time I did a change.
Allan
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