I've run the orange "Dexcool-compatible" Prestone in my 5ktq, but I've only used the blue Pentosin G11 stuff in my 200. No problems with either. I'll continue to use the proper G11 stuff in the 200 as long as I have it- it's cheap enough and I don't have any coolant leaks. Same thing for the Beetle- I'll use the pink G12 stuff. Taka