kschachn said:So which oil fares better in track use?
My race trace use shows that Ester base stocks tend to hold up better than PAO base stocks.
However, this is completely non-scientific as the only measurement I do is to look at the oil pressure gauge on the drive to the track and again on the drive home from the track.
Going to the track I see 78 PSI on the gauge invariably (new oil) at highway cruising speeds (55-60 MPH).
Coming back, I see 70-71 on PAO oils and 73 on Ester oils.
To me this indicates both oils have sheared in the 8500 RPM engine, esters not quite as much as PAOs.