VFilms
Well-Known Member
Back in the day, when I was young and worked on these MOPARS (mid '60s to early '70s), we would flush the cooling systems yearly. I remember the coolant always being a bit 'rusty'. Looking at the FSM is says to flush annually. It also states to use 1 gallon of coolant and fill the rest with water. Given the advances in coolant chemistry is it still necessary to flush the system each year, and with what percentage of coolant/water?