Penn vs Valvoline test results..Ed Wright

[Myron Piatek]

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.

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

[Ron Gusack]

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.

[Adger Smith]

This is a little off topic... but still oil related...
I've been hearing of some guys finding power on the dyno using some of the new oils designed for older Hi mileage engines. They say it is because the rings seal better. Anyone have any experience with that?