Yes I know you can't mix them, that's why I said it had to be completely flushed.

 

I think audis only used mineral based fluids so it still wont work with regular coolant man

 

Yeah, i must have a msall coolant leak as well. After long trips or highway runs at 90+ mph, I can detect a FAINT smell of coolant.

I must admit, the g12 stuff does a DAMN good job though. I drove 30 miles at about 90-100mph in Arizona, accelerating and decelerating, and the car stayed normail operation temp the entire time. Only when I turned it off and came back did the guage even show a slight increase in temp which i would assume is beacause the coolant wasn't be circulated anymore.