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Ralph Mowery

In article ,
says...

Decades of experience here with many cars. You know how many
I flushed? None. How many problems did I have that were attributable
to coolant? None.

I gave up years ago on changing the coolent. Just add some if it needed
it. I did get it changed about every 70 thousand miles due to having to
have the timing belt changed on my Toyota. At the same time I spent a fe
dollars more to replace the water pump as it was behind all the belts
and gears and the mechanic only charged his proce for the pump.

Put 200,000 miles on that car and never had a coolent problem.