Thread: Which oil?
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Old 07-14-2013, 12:45 AM
Gen1dak Gen1dak is offline
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With a hi-volume pump you get all the pressure you need using 10W30. With a hi-vol pump, 20W50 nets around 85psi....too much. You actually lose HP. The rule of thumb is 10psi per thousand rpm's. So, on a hi-vol, 10W30 is about right (35-45ish psi), 10W40 in heavy heat conditions. In your situation, I'd use 20W50 in the heat, 10W40 in the dead of winter.
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