I saw an old BITOG thread on this ancient grade of oil but noone really explained how it works.
10w20w40?
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Napa sells an oil labeled as 80w-85w-90. It's not approved by the SAE to label oil in this manner, but what they're trying to say is that it is a 90 weight oil that passes both the 80w and 85w extreme cold viscosity tests.
ah i see
They are required to put the lowest W grade that is passed on the label if it's legit. There was an issue with Lucas 15w40 where it satisfied the requirements for a 10w40.
PQIA Lucas magnum 15w40 advisory
PQIA Lucas magnum 15w40 advisory
yeah that's what i was thinking why put the 20w on the label when it already meets 10w
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