I have had quite a few pre-1980 vehicles and I use MoS2 Anti-Friction Engine Treatment from LIQUI MOLY instead of a zinc additive. As directed by their tech staff, I add it at 15% by volume to either conventional or synthetic oil. I only use it with synthetic oils after a fresh rebuild as, everybody knows, an older engine will leak through seals and gaskets with synthetic. As for using VR-1 or any other racing oil be advised that they are formulated to be run hard and changed often. They do not contain many of the additives for cleaning and anti-sludge buildup that most oils do. Not good for seasonal cruising. LIQUI MOLY also sells jugs of 10W-40 semi-synthetic oil premixed with the proper amount of MoS2 Anti-Friction Engine Treatment
... View more
