Thread: Which oil?
View Single Post
Old 07-14-2013, 12:45 AM
Gen1dak Gen1dak is offline
Dodge Ram Forum Senior Member
Join Date: Aug 2011
Location: MS Gulf Coast
Posts: 1,659
Gender: Male
Vehicle: 1990 RamCharger
Color: Red
Engine: 1988-1991 318ci (5.2L) LA V8 140hp
Rep Power: 4
Gen1dak will become famous soon enough

With a hi-volume pump you get all the pressure you need using 10W30. With a hi-vol pump, 20W50 nets around 85psi....too much. You actually lose HP. The rule of thumb is 10psi per thousand rpm's. So, on a hi-vol, 10W30 is about right (35-45ish psi), 10W40 in heavy heat conditions. In your situation, I'd use 20W50 in the heat, 10W40 in the dead of winter.
Reply With Quote