[jonathan150cc]

For what it's worth, I used to be of the perception that coolant was coolant and I would just buy whatever was cheapest at the time. That is until I owned a 1997 VW Golf. VW and other Euro-cars like to use this expensive Blue coolant. I don't remember if it's made by Bentley or Mercedes or whatever. So, being low one day, I topped it off with the green stuff because some packages say it if safe to use with coolant of any color. It didn't take long to notice an issue. The coolant in the cooling system began turning into a sandy mud and bascially just clogged its own arteries.

I pulled the thermostat (replaced it), flushed the system of all that crap, refilled with 50/50 cheap green stuff and never had another issue. But to say that all coolants are universal would be a false statement.

I think the argument that I hear most about the green stuff is that it's "corrosive" and needs to be changed at least a few times during the life of a vehicle. I say "so what?" It costs about $20 and takes half an hour to completely flush and fill your cooling system on an average sized car. Throw in a new thermostat and your only out $35.