| Cliff SEIA - 9/21/2025 09:55 Nascar is also only running a few hundred miles per oil changes in a really clean environment and a very limited number of heating/cooling cycles, I'm sure they test oil samples every oil change as well.
Nascar runs less miles between engine rebuilds than most cars get between oil changes.
Nascar runs thin oils for the same reason that car companies spec thin oils. Thick oils rob power. NASCAR doesn’t want to lose power. Car companies don’t want to be robbed of mileage for CAFE ratings.
Edited by Kooiker 9/21/2025 16:57
|
0 - 20 oil. in new engines
