Originally Posted by claluja
Latest UOA for RedLine 15w40 in this engine. Surprising jumps in oxidation from 4 to 91, and viscosity, with the same oil. If anyone has any ideas on the oxidation jump, please comment . . . .
As can be seen in this thread, never had high oxidation or this high viscosity in this engine.
Samples 2 and 3 in this pix both RedLine 15w40 HDEO, and Sample 1 was Amsoil SS 5w40 HDEO.
Sorry for the blurry picture.
When I got VOA's of Redline 5w30 some years ago, oxidation showed 108. I would say your 91 oxidation number is OK.