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Discussion Starter · #1 ·
I bought a gallon of Honda antifreeze when I bought my Goldwing in 2002 because after checking the fluids, the coolant was low. Added a little.

The dealer serviced it in 2004 and changed the coolant. Again it was a little low. Added more.

Now I'm going to do the change myself. Is my almost-full, already-been-opened, 4-yr-old jug of antifreeze still good?
 

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Mine is almost six years old and has never been changed, over 200,000 miles on it and it still works for me 8)
 

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If too old, it lets the ice melt in the martini.......
 

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I do not htink there is significant shelf life deterioration with ethelene glycol and its common anti-corrosion additives. If its the pre-mix, I would be a bit more leary, but even at that its likey OK since teh water used is distilled.

I think Tom is on very thin ice with his 200,000+ mile service life on OE coolent. The additive package wwas surely depleated long ago and those tiny passages in the radiator, block, and heads could be as narrow as hs arteries. I think you can get test strips to check the conditon of the additives and I think there are coolent hygrometers for testing freeze/boil protestion.

prs
 

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To see if it's still good pour a little into a hub cap (or pan) and let the cat drink it. If the cat dies then then it's still good to use.

That's how I test it anyway :D
 
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