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Old 12-05-2012, 04:26 AM   #49
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Join Date: Mar 2008
Location: Canberra, ACT, Australia
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My Ride: Ex 325CI owner
Originally Posted by Sapote View Post
non-synthetic oil won't damage or cause engine knock guys!!! engine oil is for engine. Synthetic oil might have other benifits (last longer between oil changes, ect.) but is not necessary.

Sorta true, but the specs are. The E46 (non M) oil needs to have a viscosity of approx 12.0 cSt @ 100C, and a minimum HTHS of 3.5. Most XW30's don't come close to meeting these specs. This is why it's easier to just buy LL01 oil, or oil that at least meets ACEA A3,B3.
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