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I would never run straight 30 weight. I would go to 5W30 or maybe the 10W30 Valvoline racing oil and if your water temp was 160 that means nothing. The oil temp could still be way lower than that. Drive it for 30 minutes and report back.




I agree. Why use heavier oil? 15/40 oil is 15 weight oil with hot properties of 40 weight. Straight 30 will result in higher pressure-especially until fully warmed.