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I have noticed that some synthetic oil has a foil top under the cap and some does not. I would not put it past a few parts stores that have fallen on hard times to put dino oil in place of the much pricier synthetic. I need to study the brands and I will post which has foil and which does not.
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2001 Boxster S 3.6L, Zeintop
"Calling upon my years of experience, I froze at the controls." - Stirling Moss
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