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Based on Castrol's data, it appears that this is a rather normal dino based oil. M1 of course, is a legit, Group 4 PAO synthetic oil.
I don't believe Castrol's oil is on the Porsche approved list; M1 is factory fill.
Castrol's Viscosity Index is 149; M1s is 187.
Your call!
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Rich Belloff
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