The car is acura integra with 1.8L engine. Right now it has 6 oz of Auto-Rx in it. It is about reaching 1K. I am thinking of drain and refill method. How much fluid am I expecting to drain?
What is about to reach 1k?
Engine mileage? Mileage on the ATF? Mileage on the ATF since you put in the arx?
FWIW, it should take around 3 quarts. Buy more than you need, then just replace with the exact amount that came out.
Good luck :)
A cooler line drain you can do yourself is easier than you think assuming you have a rubber line connecting the cooler to the transmission. Doing a cooler line flush will get all the old ATF out with the crud that Auto-Rx loosened. That is what you really want. Drain the pan then immediately do a cooler line flush. You can look up on the Amsoil website to see how much total ATF your vehicle takes.