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911/Q45 »
https://forums.nicoclub.com/911-q45-u148.html
Mon Feb 03, 2003 5:07 pm
System capacity is slightly less than 11 quarts, so technically you need 1.5 gallons of each. Check the ratio vs temp chart on the antifreeze bottle, I'll bet you can get by with one gallon of antifreeze and the balance distilled water. Spend the extra couple dollars and get the long life Prestone, it's red instead of green. If you can't get the block plugs out, you'll need a couple gallons extra of distilled water to do some repeat flushes.