Ethylene Glycol - the old standby - in every vehicle I own. I mix it 50/50 with distilled water. Brand name doesn't matter.

If you have hard water where you live, never mix it with tap water.

Last edited by Otto Skorzeny; 12/23/2022 2:52 AM.
1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)