My Lubegard and Techron experiences:
We have a 2002 EX and 2003 EX. Much earlier in these vans' lives, they would occasionally harshly engage when we would select reverse after the van sat overnight. They would do it all the time if nighttime temperatures were really cold, and the harsh engagement was much worse. I switched to synthetic ATF (Valvoline MaxLife), and that mitigated much of this problem, but not all of it.
Jerry O posted his experiences on how Lubegard red bottle helped the 41TE transmission in his Dodge Caravan not just work more smoothly and positively, but it also lasted many miles. This transmission was not known for durability. On reading this, I decided to try it in our pair of Gen 2 Odysseys.
Adding a full 10-ounce bottle of Lugebard Red to each van made an immediate difference. This essentially stopped the harsh reverse engagement problem for many, many, many years. I continued to use Lubegard at a ratio of 1 ounce per quart of ATF whenever I did a drain/refill of ATF, even after I switched to AmSOil ATF (Valvoline MaxLife had become difficult to find one year in my area, so I ordered AmSOil online). Finally, as both vans reached 200,000 miles on their original transmissions, the harsh reverse engagement occasionally came back last winter. Chalking this up to old age. They are now at 205,000 and 202,000 miles on original running gear.
We had a badly shuddering 4-speed AT on our 1998 Honda Accord. It had about 174,000 miles when we bought it, the ATF was black when I drained it. Did several drains/refills with Dexron III to "make the ATF red" again, then 3 or 4 more ATF drains/refills with Honda ATF-Z1. Shuddering on acceleration reduced, but still very annoying. Endured this for a while. Finally, I added about 7 or 8 ounces of Lubegard red bottle, shuddering immediately and markedly reduced, and over the course of a few more days of driving, stopped completely. 225,000 miles, the transmission has never been rebuilt, and it still shifts smoothly.
We once purchased a 1986 Honda Civic CRX HF that had been sitting for many months following a wreck. I performed DIY repairs (grill, radiator, headlight, and so on). That little carburetor looked horribly complex, and it was gummed up, probably had varnish in the float bowl, and the vehicle ran horribly (had to hold throttle just to maintain idle, delivered very poor MPG, and that was the least of its driveability problems). I had rebuilt Holly, Weber and Carter carbs, but I absolutely did not want to tackle this one. A mechanic recommended Chevron Techron. I added a bottle to a full tank and drove it down to almost empty. That little car ran much better, but still ran a little rough. I think I ran three bottles through three tanks of gas, total, and slowly but surely ended up with a very smoothly running CRX HF that easily achieved nearly 50 mpg in purely city driving during the three years I owned it.
OF