ExactlyBut if you already have no VII with 5w-30, what is the benefit of the 10w-30?
Sure, but their specs may not be competitive with typical values found in typical oils of similar grade in the lower digit W-rating. It’s probably why they don’t offer a No VII 0w30.One can formulate any XW30 without any VII's.
I know the HTHS is higher and it’s thicker at 100c on the HPL PCEO 5w40 than the 10w40, that I don’t understand.But wouldn't a 10w-30 still be thicker at 100c than a 5w-30. It could be a noticeable difference by the time you put a few thousand miles on the oil.
This would make a great subject-line writing a Thesis for a PhD on Automotive Oils at the College of Roger PenskeProbably a stupid question… but why does HPL no VII 10w-30 exist when the 5w-30 no VII already doesn’t have Viscosity Index Improvers?
also the case with the 5w-20 and the 10w-20?
The only thing I can think of is the 10w-40 is made on the thinner side & falls a bit below the 5w. I wonder if they include CCV in their sheets on these two.I know the HTHS is higher and it’s thicker at 100c on the HPL PCEO 5w40 than the 10w40, that I don’t understand.
There are also differences in base oils, which give different HTHS as well.There are slight differences, which potentially allow for greater shear stability and more precise selection of viscosity range.
It would make sense to scrutinize VI, since there are No VII's, wouldn't it ?
Even tho they use no VII’s, a 5W-30 would have to have a portion of thinner base stock that 10W-30, so the 5W-30 would be slightly thinner and more volatile than the 10W-30.