- May 15, 2012
- The land of USA-made Subies!
Missed this before. Short answer: yes, longer time to oxidation is better. It took the HPL roughly 7 times longer to begin oxidizing with 500psig oxygen and a temp between 130-210*C. But the catch to this ASTM test is that it does not correlate directly to service life in any way.I wasn’t familiar with PDSC, had to look it up. That was the most different result between the 2 lubes…other than viscosity. I presume bigger number is better???
ASTM D6186 said:“This test method covers the determination of oxidation induction time of lubricating oils subjected to oxygen at 3.5 MPa (500 psig) and temperatures between 130 and 210°C.”
Informative paper on PDSC: