[foxpaws]

Having an early Northstar engine in the caddy -it has gotten Barrs since I have had it - I change out the coolant every two years. It has never had a leak, or even the whisper of one. I get the kind that is ground ginger root and walnut shells, crush it, put it into the lower radiator return hose after the coolant has been drained. Someone also told me not to have the system power flushed (they just recycle that stuff, who knows where it has been) so, a gentle flush with the hose is all it gets.