I have 180,000+ miles on a Honda BVGA 5-speed Automatic Transmission behind the 3.5L SOHC V6, unknown service if any, has some shudder, some flares, the flashing 'D' light on the gear indicator, some clunking into reverse sometimes. Originally added a bottle of Lubegard Red, it eliminated pretty much all the shudder and flares. So I did a drain & refill 2x with Valvoline MaxLife Full Synthetic ATF. Obviously the original factory ZF-1 fill was blackened and very dirty to say the least. The transmission either didn't really like the thinner viscosity ML or maybe I disturbed alotta clutch material debris, and the flashing 'D' came on more frequently. A third or 3x drain & refill was done with Valvoline Import Full Synthetic ATF, much higher viscosity and the tranny liked it much better, the flashing 'D' only came on twice. All 3x drain & refills where done within 500 miles. Auto-RX Plus was ordered, mainly for this. After some research and thought I decided to go SEAFOAM TRANS TUNE before starting the RX. So this morning I drained about 16 oz of existing ATF and added 16 oz of Seafoam TT. 50 miles in today, I can feel a slight improvement, as in smoother shifting. I reason I went this route because Seafoam TT has been around much longer, purports to be safe, and other anonymous users on the interwebs testify it's effectiveness. I'm not looking for a hail-mary as my tranny isn't 100% shot. I'm thinking a double pronged attack using solvents and esters in two separate steps, with some minor overlap unavoidable. The end goal is to end up having the tranny completely filled wiith OEM Honda DW-1 ATF with LG Red at a concentration of between 1-2 oz per quart. My question is how long should I keep the Seafoam TT before dumping it? SF says as a preflush, drive at least 30 miles, and it can be left in as a conditioner, with it having such a Low Flashpoint... I can just keep it in for say for the next 300 - 1000 miles and it will eventually complete burn off right and leave me with 16 oz less in volume right??? I'm mainly using the third party universal ATF as prolonged carrier for this cleaning regime! Currently I'm just trying to figure how more many drain & refills before I start the RX, as Seafoam TT does have isopropanol in it. Will remnants of solvent and alcohol interfere or compete for space with RX? I know I gotta do at least another 1x (or maybe 2x) drain & refill before I start the second phase on RX for 1000 miles - then more drain & refills - YAY! Your thoughts? Or am I just wasting jugs and jugs of good ATF? THANKS for READING!