How miles have you put on your car using non OEM ATF.

07 Fjcruiser. Bought used with 151000 miles on it. The WS fluid was black as used diesel oil.

Did Several drain and fills with Maxlife.

Currantly has 227000 miles on it and shifting great.
Sounds like you were then where I'm at right now. 2011 RX 350 just bought 6 months ago. Fluid was jet black but no bad smell really. Also surprisingly shifted pretty well. Soon to do my 4th drain and fill with Maxlife and the color's getting better with each round, also added lubegard red on the last one. Shifts a little better and the small judder around 25mph on slow acceleration has disappeared.
 
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I've posted about this previously, but with my old Nissan Sentra, using aftermarket fluid jacked up the transmission, resulting is very poor shifting thereafter. Do as you like, but I don't feel that saving a few bucks on aftermarket fluid adds any value.
What year Sentra?
 
09 VW Rabbit - got it at 65k, serviced at 75k and about every 30k out, got rid of it around 190k. Replaced valve body around 100k (common for harsh shift). Used febi fluid.
13 VW GTI (DSG) - first service at 40k was Pentosin (OE fluid), all later services done 30-40k with Liqui Moly. A little over 200k and shifts better than most DSGs I’ve driven.
 
I have not run one licensed ATF in any of my vehicles.

2006 Trailblazer 4L60E. About 120,000km on Amsoil with Maxlife top up. Last 1k with Full Maxlife. 285k on clock and shifts as good as the day we got it.

2011 Ram 1500 with 545RFE. About 50k on Co-op multi vehicle synthetic ATF. I think it was 150k when traded in. Towed more than its weight rating for all the years we owned it. Never missed a beat.

2017 Ram 3500 6.7 with Aisin. As per manual, received pan drops every 48,000km and a filter at 100k. Has some sort of mix of OE, PetroCan Duradrive high viscosity, Maxlife Low viscosity and Co-op synthetic ATF. As above, not one issue and its earned its keep hauling heavy.

2004 Ford Escape with CD4E. Owned it since 227,000km and its around 235ish. Those 8k have been with a mix of Co-op synthetic ATF and its conventional Dex/Merc. No issues. Not sure if the fluid was original but it was well used.

The 2002 Pontiac Sunfire rez rocket with the 4 speed auto. Got it around 270,000km and i think its now 273? Those 3k are with Co-op conventional Dex/Merc. No issues. The fluid that came out looked original.

Had a 1993 GMC 1500 with 5.7 and 4L60E. It was maybe around 370,000km when we got it. The transmission begans slipping, along with torque converter shutter. Did a fluid exchange with Co-op conventional Dex/Merc. Cured it and it ran great for maybe 8000km before we sold it. That was years ago and its still daily driven by the new yet previous owner. The fluid that came out was unknown. It was nasty. Bloody nasty.

My BIL has a 1995 Jeep with the 4 cylinder and that 3 speed Aisin, I think? Unknown mileage but many years ago we did a fluid exchange with some conventional Motomaster Dex/Mer and fixed the cooling line. Still running fine all these years and no more gurgling fluid out during overheats.

What did I learn? Don't make things complicated and it's ok to save money by not getting ripped off by the dealer or licensed fluids.
 
I haven’t felt a need to stray from Dex VI for my Chevy 6L90. However I have used both AC Delco Dex VI and Motomaster Dex VI sold by Canadian Tire. I’ve tried to do a pan drop ever 50,000 miles which is easy to do on my 3/4 ton. Failing a full pan drop I have brought out 3 quarts with a suction hose. My fluid is always a bright red. My 6L90 has 285,000 miles.
 
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