[tom4416]

He has the 3.0 engine but I'm guessing that the 2.0 would require less so I should be good with a gallon. Anybody know for sure?

Don't believe the engine size matters as they all have the 6 speed auto and four quarts isn't going to be enough to change out a significant percentage of the fluid via dilution. It's $18 a gallon at Wal-Mart for the synthetic Valvoline which meets all of our cars requirements so having an extra gallon on hand is no big deal. I went through about 2.5 gallons to dilute it twice. You don't need to measure what you remove, there is a "overflow" outlet to watch for it to start to dribble out. Just follow all the requirements to warm up the transmission and go through the gears after refilling it and then recheck. Simple job unless you don't have enough replacement fluid on hand to get the weeping and don't have another vehicle to go hunt down another gallon. Plus, if you can store it, buy it now before the price skyrockets along with everything else petroleum related.

 

[tom4416]

I haven't seen it in action since I gave the fluid to a shop to do but the ratio of gallons to drain/refills has been roughly 1:1 in my case.

Or, you gave them one gallon and so they exchanged one gallon. That's why I like to DIY and know exactly what came out and exactly what went back in. Especially if the shop used a fluid exchange machine - they can be set to exchange X number of quarts or to run a complete flush cycle.