Originally Posted By: engineerscott
Originally Posted By: HondaMan
Originally Posted By: 92saturnsl2
Does anyone know off hand which oil has the highest HTHS value, of the 30 weights? Correct me if I'm wrong, but I think that specification would be beneficial in a supercharged engine (GM 3800) that is often driven aggressively.
I've noticed that the thicker GC 0w-30 I'm using now maintains oil pressure better (doesn't drop below half on the oil pressure gauge, 40 psi) when hot, compared to lighter oils such as PZ Ultra 5w-30, which often go down to 3/8 on the gauge. Whether that has any bearing (no pun intended
on protection or not, I'm unsure.
Would a thicker oil be of any benefit in this application? Perhaps something like M1 0w-40 or along those lines?
I tried this with my Silverado , I opted for Redline, very high HTHS and very thin.
Combination did not work. ... the approach of picking out a value such as HTHS and selecting based upon that one value is not sound I have learned.
Oil held up great, UOA wear was terrible with PYB showing better wear protection.
BTW, if you do go with a pure numbers approach, again Redline will have most of the best oils on paper in this regard.
Which Redline oil were you using and what were the results that lead you to conclude that the "combination did not work"? Just curious.
It's a red herring regardless. UOA's are not a "wear determination" tool. Contrasting minute PPM variances between oil brands is the ultimate exercise in futility.