I assume it's possible to get a 5W-40, but something will have to give somewhere, like a "5W-40"-like KV40. Just speculating here. Honestly, you could run the 5W-30 no-VII in a fuel-diluting engine and probably come out ahead of a regular 5W-40.
Dave would have to answer… now that HPL has changed the game with these oils, we’ll actually need expert guidance to learn/understand about what’s actually possible with these oils. Nobody’s ever really gotten the chance to deal with oils like this before
What does the the Star Polymer do for us? Shear stability? That's the oil I run.
Yes, it's very shear stable.
You get an oil that is thicker between the parts under high loads.
We might be pushing it. The Euro 5W-30 there already meets the HTHS requirements that we typically associated with 5W-40/0W-40 grades (which GC 0W-30 and BMW 5W-30 also met). Not sure if you could get from 11.19 to 12.5 without losing the 5W-xx though.
Ok, starting to get all of this now so basically, I use 5W40s that end up typically as 30W at end of run. I am on HPL4lyfe now in my GSW so will have some UOAs to look at this year but I'll probably stick with what works, don't really see the need here for me.
Yes, it does (to a point), but in that case specify a wear requirement or sulfonate dose - simply stating a high TBN does not guarantee that the TBN source does anything other than titrate against an acid.
Can you please elaborate on this statement? Thank you.
For any given hths, at warm temperatures, an oil with VII will have a higher viscosity than one without. Higher viscosity means less leakage from bearings. Less leakage means the oil is in there longer, has more time to heat up and thus the bearing/ crank has a harder time getting rid of it's heat.
Isn't the oil pump constantly pushing new oil?
Is the increase in heat not offset by the higher viscosity though? You get better MOFT to counter the temperature and then some.
The oil pump will try, but where does the pressure rise come from, it's not from the galleries and shouldn't be from the filter. Once the pump reaches it's max pressure, bypass opens and oil flow through the bearings is capped. This happens later on a lower KV oil.
