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12 At 80 psi this 383 had an abundance of oil pressure, so we decided to drain the 20W50 weight oil in favor of 5W30. The thinner oil will be easier to pump, and should free up some power. Of course, we wouldn't recommend this for an engine that has marginal oil pressure, but we only lost 5 psi which lowered our oil pressure to 75 psi. It worked, as we gained 16 horesepower.