Completely empty, including block, most systems hold about 10 quarts, sometimes just a bit more. if adding after a repair, you can use an inexpensive hydrometer to check the concentration (should be base-lined at 50/50) In very cold climates you can go a bit heavier and re-adjust when summer comes. If adding to a new (empty) engine, just use 50/50 and fill it till it's full. Begin by filling with engine off, then start it up and continue filling with heater on high heat. Turn the engine off just before it reaches full operating temp and leave it off for about three minutes, then re-start and continue filling. That allows the thermostat to open and limits back-up that happens just before that. Always check carefully for leaks...running with cap off, then with cap on and again after a short test drive. It only takes a few minutes to do and can save you big problems later on down the road.
Aside from being a conversation point, knowing how much the system holds isn't half as important and getting it full after working on it!!
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