Can someone give me a good reason why coolant is supposed to be changed? I've owned 2 Honda's and an Acura, all 3 went well over 100k, and I just now realized I never changed coolant, not once. No cooling system failures, nothing.

So, is there a valid reason to change it? Or is it like oil, everyone just "does it", yet there are no oil-related failures to be heard of.

 

I can explane it..or just copy and paste

One of the most commonly neglected maintenance procedures is changing coolant, or antifreeze. On average, for every hour an engine runs, about 7,500 gallons of coolant circulate through its cooling system. Coolant usually contains ethylene glycol, along with rust inhibitors. The life span of these chemicals is about two years, so about every 24,000 miles a complete coolant flush and change is recommended. (Check your owner's manual and product information for your coolant. Some products have a much longer life span.) Otherwise rust and impurities may build up and clog the system, or the antifreeze may become ineffective. If you ignore the coolant, a severe freeze could crack your engine block.

 

oo well no intent of hijacking ur thread but what whats the recommened transmission fluid change? I bought my civic in march and put on 5000 miles is it time or no?

 

RTFM

 

Guess you are lucky. I had to replace radiators on two of my cars, cause I could not flush them good enough to remove all deposits from old coolant.