Thread: WHAT GRADE OIL DO YOU USE
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Old Dec 17, 2004 | 08:18 AM
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Rallyesport
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What about Mobil1 15w-50 and 5w-50, are they 100% synthetic? The 100% synthetic base stock is called Group IV which Silkolene uses, while a more refined mineral base stock like Castrol uses is called group III, is this correct?
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