Green coolant good for 5 years now?

[The motor guy]

 

[The motor guy]

This is the stuff I run in my boat. Always thought it was only good for 2 years

 

[AKhan87]

5 years should be good enough.

I have seen 10+ years on OEM Toyota coolant still test good using coolant testing strips but I still change it regardless because I have seen plenty of coolant deposits inside the engine when I rebuild them, so my experience has taught me to err on the side of caution.

 

[Coolant Kid]

You'd do better to just run a cheap Dexclone. No nasty silicates to worry about.

 

[Lubener]

I have been going five years for decades using the old green and never had a problem.. I sure don't waste money on 50/50 mixes. They are only a few bucks cheaper than pure for a gallon jug and your basically only getting a half gallon of coolant.