Following an
oil change I would rather have some old
oil in the lines rather than air. It's a small percentage of the total fill.
Just changed my redline 5W-30 (all 9 quarts). Had it analyzed by Blackstone,
Zinc - 1,283 PPM, Phorphorus - 1060PPM, Molybdenum - 689.
www.Blackstone-Labs.com
Bob