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The Afton Oil Specification Handbook is the only publicly available resource I have found for consumers to know what the OEM oil specifications actually mean (https://www.aftonchemical.com/Insights-and-Resources/Documents/Specification-Handbook please rate it as helpful and thank them and ask for an update, no other company is willing to share this info).

VW 502 and 504 specify what viscosity grades are allowed to meet those specs.
Extremely good link, thank you!
 
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