Gentlemen, I am flushing out a 53 merc flathead and have Zerex G-05 antifreeze by Valvoline. Ethylene glycol is the first ingredient. Is this OK to use? Thanks, Bob Sacramento
I bought some prestone radiator flush for my 8ba. Is this stuff OK to use in the old flatheads? It says to run it for 10 minutes and then flush it out with plain water. Why just 10 minutes? Thanks. Getting this Ford ready for Tahoe. Bob