Quote:
Originally Posted by Myron Piatek
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 |
I'll do one more round with straight 30 and then switch to 10-30 to see if my test results move any.