Join Date: Jun 2007
Location: Albany, NY
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Here is a test that I personally did on my brand new Honda Prelude. It was an '84 model and proved to be probably the best car I have ever had in terms of reliability. I hope the Smart can do as well.
Anyway, thru that entire 16 year time period I never changed the coolant in the car but simply added small amounts as needed. I put 395K miles on it..same engine, same clutch, 4 timing belts and other normal wear items. I had to change the radiator at 250K miles as it rusted out thanks to Upstate NY Winters. I strained the coolant that I removed and put it back into the car.
One thing that I did do religiously was change the thermostat whenever the operating temp showed too low a temp in Winter or too high a temp in Summer. That was usually done every couple of years and these are 35-40K miles years I talking about here. Every time I removed the thermostat housing to replace the thermostat, I'd inspect the interior of the water jacket (aluminum) and it was always clean as can be and not corroded OR ERODED even the slightest bit.
After 16 years of service, I surmised that changing coolant was just another way to support the HUMONGOUSLY sized internal combustion engine $$$$ machine. As long as the engine ran in the normal range and the inside of the cooling system remained clean, why change it? Never had a freeze up, overheat or anything else like that with that car.
FWIW, I never changed one hose on that car either in all that time but that's a different test and story.
Don't take the word of your friendly antifreeze coolant peddler when it comes to changing/flushing out the coolant system...HE SELLS THE STUFF!!!
Last edited by jonnysan; 06-05-2009 at 05:26 PM.
Reason: misspelled word