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Old 05-28-2004, 11:01 AM   #38
cary1
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Join Date: May 2004
Location: US
Posts: 94
My Ride: Car
Quote:
Originally Posted by Commander FAT
FYI all.

http://www.mobil.com/USA-English/Lub...bil1_0W-40.asp

Anyway, what's happened to my engine now that I've gone 15K miles with Mobil1 5w-30 oil?
Most likely nothing. If you were doing oil analysis you would likely see slightly higher Iron and Lead numbers than with the heavier oil. Where I would be really concerned is long trips at high speed in hot weather or lapping days where oil temps are high and the oil thinner than normal. Potentially under these conditions you could cause accelerated piston, valvetrain and cylinder wear.

Remember that the reason the BMW NA recomended Mobil 1 5w-30 as topoff oil was the recommendation was put in place 8-10 years ago. At that time there was no 0w-40 only 5w-30, 10w-30 & 15w-50. BMW NA has never updated this recommendation.

Cary
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