the only people who really know are those design engineers who specced the oils requirements and those who formulated the brews. Few of each, and no-ones giving any secrets away. I doubt the sales technicians we get to speak to ever really know whats in a brew.
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1994 850 2.0 bought at 32,000 miles used daily now 45,000. Still like a nearly-new car 
2004 filthy polluting diesel VW
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