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if the ambient temp is under 50, and you're not putting the engine through much i could almost get behind a 30 weight oil. but still, it's going to break down too quickly under the heat and pressure once the engine is up to temp.
not to mention porsche's recommended oil weights are 0w-40, 5w-40 and 5w-50
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"Speed has never killed anyone, suddenly becoming stationary... that's what gets you."
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