Valvoline says their syn contains PAO

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Originally Posted By: LoneRanger
Leaving it at SM would allow them to include higher levels of Zinc and Phos than an SN compliant formulation, yes?

No. The API additive limits don't apply to Xw-40 grades.

That's why M1 0w-40 can claim API SN compliance, despite having a rather rich ad pack.
 
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