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I agree with the basic math, but make sure you factor in the SCA's as well. I decided to go 100% BASIC green, distilled water and SCA's.

And to clarify my previous comment. I used Prestone coolant flush on the first fill. Drain. Fill with flush and distilled, drive, up to temp, then cool a bit, drain, then repeat one more fill with distilled, drive, drain, and then fill with the coolant. I think it might be a bit obsessive...

Even a thorough drain from beneath the oil cooler will still leave 3 gallons in the block. Fill with water and drain, then repeat. I used distilled water for that reason.

If you have a coolant filter added, make sure you don't get the charged filter by accident, just use the plain Jane one.