Well, my engine (M103), has so far responded extremely well to Mobil 1 0-40W. Within 2 days of using it with a Knetch oil filter, all of my top end valve noise that was usually present upon cold start up disappeared. The engine does seem much more smooth, but that could just be me wanting that and thinking it is there... The valve noise was real, and is really gone now! 
__________________
2006 BMW M5 "Heidi" @ 109,000 miles
2005 MBZ C55 AMG "Lorelai" @ 165,000 miles
1991 MBZ 300E "Benzachino II" @ 165,000 miles
1990 MBZ 500SL "Shoshanna" @ 118,000 miles
(On the hunt for a good used M103 engine as of 6/10/23, PM me if you have one to sell!)
|