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that is an interesting piece of info ! Do you know for certain that engine failures in one way or another relate to semi-synth ? What is the opinion of others ? At least in my case the dealers have been filling semi-synth until recently and perhaps still do if customer chooses not to pay for the full synthetic they offer (which is not M1). Last year I have been bringing M1 0W-40 along for the oil change at the dealer.
posted by 213.64.224...
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