So I'm in the process of looking at cars for the BIL, we found a 2011 Cruze Eco, while looking around the car I noticed the coolant was low (common problem GM said is due to air being trapped in the system from the factory and burping out later). So I brought it to their attention so we hop in and they drive it into the service bay. I watched a service guy put in napa green coolant as i watched in horror, as i've read on here green and Dexcool DO NOT MIX! I drive a GM car so I knew that from prior research. So this is where we stand, he really likes it and is in the process of buying it, how can I bring it up with them at the signing time that I watched them put incompatible coolant and they should replace it before the deal is final? I think they will just brush it off and try to tell us that it's fine and it's compatible. Any advice? It's in the 30's here and I don't want to do it myself in this cold and don't want to pay a GM dealership >$100 on a coolant change already.