Quoting keybaud:
Out of interest, did you read my follow up post, or just poke sticks at the one you quoted?
p.s. If race engines pre-heat an oil, do they even use a multi-grade? Why would they use a multigrade such as 10W40 if you're going to heat it up to behave like a 40 before it gets used? Surely, it would make more sense to just use a 40 weight?
Apologies, I missed that there was a second page.
Re race engines, we pre-heat the oil for my race engine and do use a multi-grade.