G-12 only with distilled water
G-12 has all the needed lubricants for our water pumps, bearings, ect. as well as the anti-corrosion compounds nessesary to keep our engines and radiators clean. I changed at 60,000 miles and the coolant mix was pristine and new looking. The tech. at VW that did this service did not use a pressure or vacuum filler so an airlock formed and I did not find out about until the next day. I drove home from the dealer at reasonable speeds putting the remaining jug of G-12 in the back seat. The next day I drove somewhere in very hot weather at about 90 or so and that extra RPM and heat "pushed "that airlock on thru creating a low coolant level in the reservoir. The alarm and buzzer went off and I pulled of the road with the engine running. The engine just did not seem that hot, but I did notice no coolant in the reservoir. I added the G-12 from the backseat and drove home without any alarms, ect. Apon checking level at home, it was low again, so I added distilled water up to the hot max level. The next morning after everything had cooled and the coolant had syphoned back into the engine, I added a 50%-50% mix up to the cold engine min mark. No further level probs. have ever occured again. If no G-12 is around,just add distilled water until you can find a VW dealer. G-12 only cost about $12 to $13 a gallon and our engines only use 2.6 quarts of it. It is the very best for our cars no matter what anyone tells you about compatibility. You will sludge up your engine which will require a whole lot of flushing and you still may not get all the crud out....Turbomania