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This may be a dumb question but if the new Mazda 0w-20 is made by Idemitsu, and is SN certified, and the old Subaru SM is made by Idemitsu, can we not assume the new Subaru SN will be very similar to the Mazda oil? I have no idea I'm just wondering if when my Subaru dealer stops carrying the SM oil if I should go across the street (literally) and get the Mazda SN.
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