Is Mixing ATF fluids OK?

Messages
90
Location
MO
I'm due for a ATF fluid change on my '95 Saturn SC1 with 221K miles. I have about 1 3/4 quarts of Mobil 1 left over from my previous change. Would it be prudent to mix this with something like Maxlife ATF? If it matters, this is Dex III.
 
Messages
2,500
Location
Dallas, Texas
Yep, it will be fine. I have 3-4 different types of Mercon V in my F-150 right now. Fresh and meets the specs is all that really matters of a fluid. And a quart of two of one type isn't going to change all that much in a system that holds 12 quarts.
 
Messages
14,668
Location
The Old North State
Mix Dex III with MaxLife, did that exactly in my Tacoma specing DexIII with a drain and fill. Been a few years and have done another since and well over 20k miles now and all is well. ML is compatible with Dex III. As are a good number of other multi vehicle ATF's.
 
Messages
14,816
Location
Central NY
I have mixed and matched and haven't experienced an issue with my Cherokee (Toyota transmission). It specifies DexIII/Mercon. When I bought it, I did a drain and fill with Mercon V fluid. Have done a few drin/fills with leftover Mercon V then, when I ran out of that I used Supertech DexIII fluid. Last trans fluid change was with Mobil ATF D/M.
 
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