Originally Posted By: Johnny
I personally would stick with the 5W-30 no matter which oil you decide to use. I don't know that the PP would bring the numbers down, but you could try. I've seen V-8 GM's show high lead readings up to 60K before they start coming down.
i think your right! every builder i have talked to says gm is kinda loose on the crank balancing tolerances. i bet it will clean up over time.