Originally Posted By: CharlieBauer
Originally Posted By: SR5
KV100 = 9.2 cSt (typical thick for grade Castrol, me like)
Noack Volatility = 11.6 %
Isn't KV100 mostly irrelevant and the HTHSv the important measure?
In their 2015 PDS, Castrol said HTHSv was 2.6 (2015 PDS).
And Castrol say the Noack is 13.7% (2016 PDS - 12.5% in 2015).
Yes I agree with most of what you say, HTHS is more important than KV100, but they usually go up and down together, and PQIA don't test HTHS, but I sure wish they did.
Sure PDS data sheets give some different values, but when PQIA test a group of oils together, it's a fairly level playing field, and so a good way to compare different oil.
Given these are real products, pulled from the shelves and tested in the same lab on the same equipment, the GTX is my pick of the bunch. And it's pretty easy to find too.