Interaction between Methanol blow-by, and Royal Purple oil? Kinda thinking that castor oil tolerates methanol.Funny,it had run several races and won them all with castor oil in that engine. I was low of castor oil to went to NAPA and got a couple quarts of Royal Purple. It ran fine in the first heat race and seized after 5 laps in the second heat race. I was building my own engines and all the engines for our team and never had one seize until I poured that crap into it.
But no experience, I'm just half-remembering and half-guessing.