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As JFP stated regarding the debate, oil issues have been beaten to death on this and other forums. I've used RP for years in my cars (mostly 911s), but for one reason or another, have switched to Castrol Syntec 10W40 for the last couple.
I will not use Mobil 1 or any other 0W40 product in my Box S...too thin.
You can usually find Castrol Syntec for under $5 on sale at AutoZone or comparable.
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JGM
2002 Boxster S
1973 911 Green FrankenMeanie
PCA DE Instructor circa '95
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