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Originally Posted by Sbrigati

My plan is to do a second fluid change again in the spring to get rid of the remaining "old fluid" since the car is supposed to hold over 10 quarts, so 30%+ old stuff still in the system.

Drain 7, leave 3, new mix is 30% old fluid.
Drain another 7, leave 3, new mix is 9% old fluid.
Sbrigati only has 1 post, but any hatred toward my smart-ass math would be fully justified