Not Ranked
Switched from 20W-50 Castrol to 15W-50 Mobil 1.
I wanted to try lighter but this was the advice of the engine builder. He said 10W-40 Mobil 1 is good for the cooler temps.
No doubt the cooler Mobil 1 flowed thinner than even the heated Castrol . My idle pressure was close and ..yes...may have risen to 65 from 62 psi. I have crossed over !
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