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Always use G12!! You can pick it up at your local VW or Audi dealership.
It goes in the top left tank reservoir. And BTW Audi recommends using G12 coolant, i wouldn't use that green stuff either.
Yes
G12, the red stuff. Make sure there is no air in the system after you flush and fill it.
G12
The Owners Manual cites green (conventional) and yellow (long-life) for Taurus / Sables
BS. They are not at all standardized. Use VW/ Audi Pentosin , or another product called DexCool if in a pinch. 460 Jetboat answer you should stick with whatever antifreeze the manufacturer recommends. Those colors aren't there just for marketing purposes; each one denotes a different chemical composition. If Audi recommends that you use yellow or pink antifreeze (which they do for newer models), then stay with it. Remember also that your cooling system will still cool and lubricate itself with as little as 30 percent antifreeze to water content. If you're a little low and need to top off, you can't go wrong with deionized water.
Change the oil/filter every 5,000 miles if you use conventional oil, and every 8,000 miles if you use synthetic.
Have you spilt some on the radiator?
Conventional antifreeze is generally good for older vehicles. You can also consider 'long life' antifreeze - it's good for all make, model and year of vehicle or original antifreeze color. PEAK Long Life Antifreeze will protect for 150,000 miles/5 years. If your antifreeze hasn't been changed for 2-3 years for conventional coolant/antifreeze or 5 years for long life formulas, it's time for a flush and fill. - PEAK Automotive; peakauto.com
Audi Q7 3.0 TDI quattro: Cooling system capacity (incl. heating) in l approx. 9
A good quality antifreeze mixed 50/50 with water