Why is this happening? Is it because the 5w30 is thinning out faster than the 10w30, and so the 5w30 is not allowing as good of a seal? (more fuel past the rings?)quote:
Originally posted by MolaKule:
The only timer I experience blowby, is when I go to the 5W30 in my vehicles. These oils do turn darker much quicker than the old standby 10W30 that I use.
I think it's because the 5w30 shears down under stresses in the cylinder wall, thus allowing more blowby...particles in blowby become suspended in oil...oil gets darker faster.quote:
Originally posted by Patman:
Why is this happening? Is it because the 5w30 is thinning out faster than the 10w30, and so the 5w30 is not allowing as good of a seal? (more fuel past the rings?)quote:
Originally posted by MolaKule:
The only timer I experience blowby, is when I go to the 5W30 in my vehicles. These oils do turn darker much quicker than the old standby 10W30 that I use.
This is going against by what I'm experiencing though. Delvac1 5W40 is getting darker faster than Tech2000 synthetic 10W30 in the same amount of mileage...just weird I tell ya!quote:
I agree with Jason. Thinner oil on cylinder liner (wall), rings don't seal as well as with a thicker oil, more blow-by, more carbonized particulates in oil, oil turns blacker - sooner!
Yeah, which is making me wonder if I should even try AMSOIL or Schaeffer 5W30 this winter. The other post regarding the use of 5W40 for engine longevity has gotten me confused.quote:
Oz, that's because Delvac 1 has a LOT of detergents in it, way more than Tech 2000 Synthetic for sure. Remember, Delvac 1 is a diesel oil, and needs more detergents as a result, so it will clean your engine of old deposits quite rapidly