Originally Posted by re-rx7
The best way to figure out what viscosity of oil you need is to drive the car in the conditions you will use. Then use the oil viscosity that gives you 10 PSI per 1,000 RPM under those circumstances. For some reason very few people are able to get this simple principal correct.
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Very informative post, thank you. I don't think most people knew all of that information. In these cars it is impossible though, to figure out what oil pressure we have since the factory gauge doesn't give a reading in measurements of PSi... or any measurement for that matter. So we are forced to get an aftermarket gauge. But that's another topic all together.
I do have to ask though about the 10psi/1k rpm ratio. At operating temps at idle I would read 30psi at 800rpms with the LS1 using 5W30. With my 7MGTE at idle using 20W50 it would read just under 40lbs at 1,000rpm as shown here. Ignore the OU flip flops.
So do you mean 10psi per 1,000rpm above idle?
-Alex
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