Quote:
Originally Posted by roflcopter
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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An oil analysis on the Subaru SN and the Mazda SN will show that they are blended differently. IMO, it's tough to make a decision about one additive in oil being the decisive factor in choosing an oil. But after running both Motul 300V and Red Line, an oil with lots of moly made the
biggest overall subjective difference in any oil that I've used in 15 years of changing my own oil in Subaru's and trying many different brands and viscosities.
Someone on nasioc that tried Red Line 5W-30 went with the 5W-40 because he felt there was too
little resistance in the engine with the 5W-30. I told him that was the way that it was
supposed to feel. Keep in mind that 300V and Red Line are both made with ester base stocks and contain a lot of moly, so I do not know if the difference felt is from the moly alone or a combination of the two (most likely).
That said, I would probably choose the Mazda oil over the Subaru oil to see if there is any subjective difference.
-Dennis