Quote:
Originally Posted by Verdoro 68
Yes, 15-50. I ran it because that's what Butler recommended. I have a Butler 60 lb pump with a shim and I was seeing the gauge pegged to 80 while cold and while driving.
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For reasons of their own, Butler wants molasses in the oil pan. I think they're nuts.
Quote:
Originally Posted by Verdoro 68
The 15-40 I put in knocks the pressure down to 75-ish while driving and a little under 40 at idle when hot.
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Next time, try 5W-30.
MAYBE 10W-30.