They have cut down the permissable levels of additives containing zinc , phosphorus etc etc in the oil over time in conformance of new and newer environment regulations ... from older ( obsolete ) api class like SG to the the present SL and SM ratings . Some of this cleanup doesn't go well with the older engine designs we have too , particularly the gradual depletion of ZDDP in the newer oil types . Well this is as much I could gather from it
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I always thought its a mineral oil little better than Motul 3000.

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