Chuck B
Full Access Member
Dexcool (stock coolant) was developed in Sweden as a lower toxic coolant than PG. Biggest issue with Dexcool is can't be mixed with PG. To make the switch over you really really really have to make sure you have flushed the system of all Dexcool. Talk to any early GM mechanic who dealt with Dexcool when it hit the market in I believe early 90's. GM was first to use it as standard fill. Also Dexcool turns to sludge if left in the system too long or exposed to O2 for very long.