Quote:
Originally Posted by rice_classic
You've got part of the equation which "flow is good". Pressure is an important part of the equation too.. I'm totally fine with running as thin an oil as possible so long as target pressures are maintained. But if I can't make more than 50psi at 7k rpm with a 20wt oil at my operating temp (280f in your case) then I either need more viscosity or less temp.
What's your oil pressure at 7k rpms when your 30wt is at 280F?
|
I looked but couldn't find the track logs that I took last year,
if you're referring to the instant drop at those levels (280F and 7k rpms) I have to say 280F is my ceiling and I immediately go for a cool down lap and fresh oil makes a lot better job on protecting the engine than the old-thicker oil ..
keep in mind, we all noticed a drop in our oil temps with 5w-30 like many other people who have done the switch ,so if I have to choose between lower oil temps over a slight disadvantage of the pressures I would always go with the lower oil temps since I see it as a preventive method,