I have used Texaco Dexcool 50/50 with distilled water in the '86 760T for several years without trouble until recently. Now I keep topping up a pint and a time. I can see small leaks at coolant hoses to and from turbo and lower radiator hose at the engine. These are brand new hoses in the car a few months with new clamps kept tight, but I see small residues of dried coolant on the metal surfaces. There are probably other leaks because these seem too small for the amount of topping up I am doing. Unless I can find Zerez Glysantin soon, I will probably go back to Volvo coolant.