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Engine Oil brands
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10-04-2006, 02:28 PM
uberwgn
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Join Date: Jul 2005
Location: New England
Posts: 979
Shell Rotella syn is Group III oil that originated as a petro product. M1 5w40, 0w40, 15W50, etc. are all GroupIV/V blends. Both can be described as "synthetic" in North America.
Personally, I stick with a mfr- or ACEA-speced lube in all vehicles.
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