Originally Posted By: OVERKILL
Originally Posted By: Topo
Originally Posted By: 440Magnum
Originally Posted By: buster
Pennzoil Ultra is the numbers king.
WHY would you say that? Its certainly good, but "king?" Not of anything except NOACK. Its thinner on all the viscosity numbers than M1 (not necessarily a bad thing). You could even argue that its more nearly in the middle of the spec window than some others, but still the only clear "king" factor I see is NOACK. And yes, it wins that one by a mile.
I ran the premium royal purple in my car which has and outstanding Noak, yet my car burned 2.25 quarts in 6,000 miles, worst I have ever seen on my vehicle. So sometimes Noak isn't everything, would you agree?
We have NOACK figures for the other version of RP?
For their XPR series, all I see is this:
Quote:
Royal Purple does not provide physical specifications on its racing products. Please consult Royal Purple’s automotive
technical support department at 281-354-8600 or 888-382-6300 to determine which racing oil is right for you.
I'm talking about there SL Rated Version with Synerlec, prior to coming out with a SN version. Not their racing oils.