That would be the best way is to siphon out and add back the same measured amount, but why not wait and see later if you really need it. Give the flush a chance.

 

I should also note that I had the flush about 4,000 miles ago. Everything is great for the most part, just get the occasional "fish bite" in very rare circumstances. It's not bad or frequent enough for me to duplicate it. Especially not enough for me to try and duplicate it for the dealer.

 

You can do as you said and try adding the additive and see if it works. Nothing to lose.

 

Great, I'll give it a shot. Has anyone else here actually done this with successful results?

 

I would add gradually until the condition is gone. That could mean several attempts to find the right mix but it wouldn't be overkill either.
I would think applying drops from the red tube would be easier. The tube is a concentrate.

 

I had my torque converter replaced under warranty, and they changed the fluid. When I got the truck back, I could see drips of ATF and grimy handprints on the bottom of transmission pan, and the exhaust's Y-pipe. Before the job, I offered a tip if they'd do a nice, thorough job. That didn't happen.

I drove the truck for a while and when I had time, I drained out about 6 quarts, and removed the pan. He didn't even clean off the magnets, and they were so overloaded with ferrous material that they couldn't hold any more. The entire bottom of the pan was covered in ferrous material (worn plates which is what required the replacement). It was a shoddy job and they thought no one would ever see it ... at least not until it was well out of warranty.

Anyway, if you're gonna go through the trouble of siphoning out some fluid and adding an expensive friction modifier, I'd kindly suggest dropping the pan, cleaning it yourself, replacing the filter (cheap, pulls out, pushes in), and maybe have a new gasket on hand. Then you won't have any worries or second thoughts.

What can happen when the magnets get overwhelmed with ferrous material is that the ferrous particles will circulate in the system indefinitely and tend to be attracted to the shift solenoids which are just electromagnets. Over time, the accumulated sludge will slow down the shifts and cause hesitation. It might not happen for years, but it's a strong likelihood.

Have fun!