I have a BMW... It is about 10 years old and like many other BMWs it has cooling problems... I live in Los Angeles and normally in the summer that's the only time there's a problem... Lots of idling because of the traffic... It's been hot lately and I decided to try it because my mechanic tried a lot of things and the Temp gauge sometimes "creeps up." "I rode it today and it was in the 80's and had no issues with creep. For the first time in a long time (in this heat) I've said enough! (I do direct distillation in the summer, and it has anti-rust additives. Install!