When I did mine I added 6 quarts, let the car idle for a bit, went through the gears a few times (P-2)then topped it off. Make sure to check it the next day or so after you have a few miles on it.

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2006 CL500
2009 C300 4matic
1969 280SE
2023 Ram 1500
2007 Tiara 3200