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btbiii 03-15-2009 08:14 AM

Oil Viscosity
I just purchased an 1988 M3 Thursday. The previous owner has been running 5W-30 & 10W-30 Oil in vehicle. I have always run 15W-50 in my previous E30's per the original owners manuals. I have a Chiltons manual that also calls out 15W-45/50 weight oil. Which is correct? Thanks in advance for any help.

raslion 03-31-2009 05:47 PM

I went to and they posted 15w 50

Court M3 04-05-2009 10:10 AM


Originally Posted by raslion (Post 4051502)
I went to and they posted 15w 50

+1 lots more info on there

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