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Yes I know that a good high temperature test result does not mean that the oil will perform well in an engine. But I think you will agree that a very bad high temperature test result (320F...not insanely hot and wasn't tested for very long) does not bode well for performance in a hot running turbocharged engine.
JAG, you really need to do a "real" test. My engine has been running 5W-40 BioSyn for over 15K miles. During that time it's seen 10F to 105F ambient temperature, local stop and go driving, multiple cold starts during winter days after full cold soak, long trips during the summer at 105F, and 5 hours of track time at Lime Rock and Watkins Glen.
My normal engine oil temperature ranges between 212F to 235F on the street. On the track the oil temperature ranges between 250F and 275F when the engine is under severe stress under full horsepower at 8,000 rpm. UOAs show no oxidation, no soot, no viscosity shear beyond the initial shear, no additional acid formation, no combustion problems or deposit formations. Finally, visual inspection of the cam shaft through the oil fill shows no varnish buildup.
This engine has 31K miles on it, with the last 16K miles of runtime on the engine using RLI BioSyn. The current oil has been in the engine for 5,700 miles and just came back from 2 days at Watkins Glen. Iron wear rates (not just ppm levels) are running 2x to 5x lower than Audi 502 approved oils, and have been continuously since BioSyn was introduced.
Here's a picture of a cam lobe taken through the oil fill in the valve cover. Note, the valve cover is a funky yellow plastic composite.
What more could you want? An expert opinion from an independent expert tribologist who's been practicing for 30 years? Oh wait ... we have that, too!