Originally Posted By: Lifeguard
Originally Posted By: tlowe #1716
I would not use a 5w anything oil in your 250 or mine. 10-30 at minimum. I also add a 1/2 jug of GM EOS at oil changes for the cam.


How much ZDDP does 8oz of EOS add to 5.5qts (using the 1qt filter instead of the 0.5qt) add to 800ppm ZDDP oil?


I should note that the Valvoline VR1 synthetic (black bottle) API SL 10W-30 I use is tested at 1100 ppm ZDDP.