I have a 418W with 530 hp with a high volume
oil pump.
I run 10-40w. My cold pressure is 65-70. Idle pressure when hot is never below 45. At any higher RPM its 65.
The engine builder initally recommended 20-50W.
I explained my climate in Wis. and they then said 10-40W would be good.
The Nut
