Any thoughts from experienced users of these particular oils are welcome! I'm particularly interested in each oil's chemistry, given the strong reputation of both brands.
Key difference is that Millers COR is a semi-synthetic with claimed increases in flow and reduction in friction, whereas Valvoline is a highly refined pure mineral oil with high Zinc content and a large fanbase.
Edited by Screwdriver, 10 April 2018 - 04:07 PM.