hi sages- my 92 240 has clean coolant but the anti freeze seems kind of weak and thin. has green coloring so i think it is standard permanent ethylene glycol type. planning to drain out about a gallon and put in a fresh gallon of straight at freeze such as peak (no 50/50 mix) or another green color brand. dont want to get soaked by volvo. have used the green stuff for many moons and have had no problem but that was with other cars not volvos. figure dealer is lying about the special nature of there at freeze just to clip me. always try to obtain a 50 50 mix for anti rust strength ,water pump lubrication and longevity. try to maintain it so 5 balls are floating in the little turkey baster tester we all use.no overheating. temp needle goes about 1/3-1/2 the way and stays there. dont have to worry about cold here too much in fla. will be 92 today. thanks tons. oldduke