I found that I had to replace about 3/4 gallon from the radiator alone - however when you take out the radiator, your expansion tank is going to drain along with the forward parts of the engine block. I'd get at least a gallon of antifreeze and a gallon of water for it.

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth