This did not seem to be mentioned in any previous posts, just "run it until all fluid is out of the system" which would lead a person to believe to run it completely dry. I actually had my helper shut it off before all the fluid left the pump, and it was right at the last moment as the engine was stopping that I heard a squeak that sounded like there was no more fluid in there. Also, 2 gallons are probably needed to fully flush the system, as it will go through a gallon in about 8 seconds, almost faster than can be poured in.

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1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Highly Optioned, 350,000+ Miles