Quote:
Originally Posted by Ron Gusack
This might be true Alan, but I don't see the same amount in the pan after switching to Brad Penn, which has no moly. If I convince myself that the VR1 has better wear numbers, I'll gladly live with some goop in the pan.
The question that I can't seem to get a decent answer to is why so many racers use multi weight oil instead of straight weight.
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It's my understanding that multi-viscosity oils get circulated faster on start-up when it's cold, which helps protect sooner and reduce wear. I also read some time ago that multi-viscosity oils make more HP, but I don't recall why. It might be that drag engine oil don't usually reach "normal" operating temperatures, if I understand viscosity numbers correctly. (i.e.:
10w-30 - 10w=cold, 30=hot.
Valvoline says that straight weight oils are usually recommended for smaller and older engines.
5th question down:
https://www.valvoline.com/about-us/f...-viscosity-faq