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Old 12-30-2016, 06:35 PM
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Dwight Dwight is offline
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Cobra Make, Engine: RCR GT 40 & 1966 Fairlane 390 5 speed
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You want a thin oil when you first start the motor and one that thicken up a little when the motor reaches operating temperature. Hence 5-30w

If you motor was build with tight bearing tolerance you would need a thin oil. A motor with loose (race) tolerance would need a thick oil.

Dwight
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