'03 540i, (V8) Dinan tweaked. 140K miles. Been using m1 0-40, but my stash is gone, and new version doesn't have LL01 certs. Also getting a little startup rattle. So I am going to up the grade a little, maybe 5W-40 or even 10W-40. Living at the edge of the desert in SoCal, never run/start below 40°, and usually 100° and up in summer.
The real question is: considering the advances in gasoline and oils since the LL01 specs came out, what could possibly hurt my engine if I left LL01 behind?
The real question is: considering the advances in gasoline and oils since the LL01 specs came out, what could possibly hurt my engine if I left LL01 behind?