I drive a 94 Plymouth Voyager with a 4 speed FWD Automatic transmission. My van would not run in drive until the vehicle completely warmed up and even then it would stick in 1st gear at times. I changed out the filter and fluid but there was hardly any improvment. After adding a bottle of your Auto-RX, my car began to shift properly within 50 miles. Every day it seems to run a little smother. I'm sure that by the time I put a 1000 miles on it as per your directions it will run like a new transmission. Thank you again.

A little over three weeks ago the automatic transmission in my wife's 95 Explorer unexpectedly failed, and it cost $2,800 to rebuild, using all top-quality, updated and upgraded parts. We also have a '76 Chevrolet C20 pickup and an '83 Ford F250IHD 4x4 pickup, both of which have automatics. I bought the Chevy six years ago, and the transmission had been rebuilt two years before that. Since that time, I've totally restored this truck, and replaced the worn out 350 V8 with another 350 V8, based on a '00 Vortec 1-ton short block, but with AFR cylinder heads. This engine puts out over 350 hp. Over the last few months, the transmission has begun to fail to go into gear upon a cold start. I would start the engine and put the trans into Reverse or Drive, and nothing would happen, until I put it into Neutral and revved the engine a few times. I checked that level of the ATF (of course, after fully warming it up, and with the trans in Park), and it was where it should be.

When my wife's transmission failed, I took the opportunity to talk to the trans tech about what my C20's transmission was doing. He told me that if the fluid was full, then it was likely that rubber parts inside the trans were becoming hard. After reading a lot about Auto-Rx at www.bobistheoilguy.com in the "additive" section, I decided to give it a try in the C20's transmission. What piqued my interest about Auto-Rx was its propensity to recondition engine seals... I reasoned that it just might recondition the hardened rubber parts in my trans that were causing the problems. I added Auto-Rx to the ATF in the C20, and within a few days the false neutral problem began to be less severe... instead of having to shift into Neutral and rev the engine, I could simply wait a few moments and the trans would engage into whatever gear I selected. After a week, the false neutral problem stopped happening - at least it has now been about three weeks since it last happened, and it used to happen at least every other day. It appears that my hunch was right -

Auto-Rx has indeed rejuvenated the rubber parts in my trans, or whatever parts were causing the problem. I still have over 500 miles to go on the C20's Auto-Rx treatment, before I drop the pan, change the filter and then hook it up to my shop's flush machine for a total trans flush with new ATF. As for the F250, it has 100,000 miles on it, and it still has the original C6 automatic transmission. The original owner of the truck had been in the habit of having the trans flushed (as opposed to pan drop, drain and fill) every 30,000 miles, and when I bought the truck, I was advised to flush the trans soon, since this truck was "used to" regular trans flushes. When I dropped the pan and changed the filter, I was impressed with how clean the trans internals where... it really is a testimony of how important regular auto trans maintenance is! Anyway, I flushed the trans and was impressed with how nicely the trans shifted, especially for being 22 years old and for being behind a healthy 460. At the same time I put Auto-Rx into the C20, I also put it into the F250, mainly just as a precaution, since it is so old. I figured that it would just give it an extra-thorough cleaning, and rejuvenate any internal rubber parts that may need it. Imagine my surprise when my wife and I noticed that both trucks were shifting more positively and crisply! Even though I had not felt the F250's trans could be improved, it WAS improved by Auto-Rx. The C20 not only has stopped having its false-neutral problem, but the trans is shifting noticeably better, with more responsive kick-downs and crisper shifts. I am so impressed with what Auto-Rx is doing in my transmissions in such a short time, I am finding excuses to go out and drive the trucks in order to move the Auto-Rx process along.

One final note for now: there are lots of auto trans additives that use sealants and other "quick-fix" ingredients, but these are short-term solutions. I've read extensively about this, and Auto-Rx is different because it does not modify the characteristics of the ATF itself... instead, it uses the ATF as a carrier to distribute itself to all lubricated areas of the transmission. Once there, it simply cleans the metals, the seals and everything it contacts. It does this by emulsifying deposits - converting them into liquid form, so they can be carried away and filtered out. Once you drain the ATF/Auto-Rx mixture out, your trans is left thoroughly clean. If you have mechanical problems, Auto-Rx will not help, but if your problems are related to deposits and other buildups, then Auto-Rx will help. I will continue to send in updates as I progress through the Auto-Rx treatments in my C20 and F250... obviously, so far, so good. Everything I've written here is my actual experience and is true.

I have a 1997 Ford F-250 diesel 4x4 truck with an automatic transmission. I used Auto-Rx in the transmission because it was shuddering during shifts. It was really noticeable when pulling my boat, which weighs 12,420 lbs. Since the transmission is the weak link in these trucks I decided to use your product. I applied the treatment twice since the truck now has 160K miles on it. The shifting problem cleared up and I've put replacement plans on the back burner. Your product has made an amazing difference in how my truck shifts. I've also used it in my engine. The engine runs smoother since the treatment. Thank you for an excellent product that does what it promises. I am in the process of treating my other vehicles and I'll do my boat engines in the spring. Feel free to use my letter in total or part as a testimonial for your product.

1998 [Lexus] LS 400 with 70,000 miles. Ran 8 oz of AutoRx in transmission for 1500 miles. I have had this intermittent "jerk" on takeoff from standstill since I bought the car with 30,000 miles. Well, well, I just finished doing a backyard flush this evening, refilled with Toyota Type IV ATF, drove it around to get fluid hot so I could get proper amount of ATF in tranny. Overfilled (why do I always overfill????) and had to suck a little out.

Guess what. So far I've had 20 or so stop and goes with no "jerking." Hmmmm... I get confused when stuff I buy actually does what it is supposed to...

Here are my personal thoughts about your product:

" I recently bought your Auto-Rx for Transmission product.
After about 4 weeks of use, about 400 miles of driving, I am noticing a significant improvement in the performance of the transmission.
I am so impressed by this product that I am purchasing the Auto-Rx for Engines for my automobile.

Thank you Auto-Rx for being a real problem solver."

I am not hallucinating-this car shifts WAY better, smoother, quieter. I was a little leary of putting ANYTHING in this trans (other than genuine Honda fluid), as I know Hondas are known to be fickle.

I'm sold.

It works!!! Tranny has 122k mi and did not have any real issues. Was running Auto-Rx® in oil and got 3 for 2 deal, so I ran 6oz in trans for 1100 mi. This had a previous changeout of genuine Honda 3.5 qts, drive 100 mi and 3.5 qts again about 7500 mi ago when i got it and had to put in new driveaxles, so I changed fluid. In other words, the fluid was fairly fresh when I put the rx in. Got t-tech fluid exchange today and brought my own Honda fluid-don't trust their stuff. The old fluid was darker-not very much (as in black) and not appearance of burned or anything-just darker.

I am not hallucinating-this car shifts WAY better, smoother, quieter. I was a little leary of putting ANYTHING in this trans (other than genuine Honda fluid), as I know Hondas are known to be fickle. I'm sold.

Here is a good experience with using your product Auto-Rx, that's worth telling about. We own ,a now-well worn-1991 Mercury Sable, since 1995, currently with 250,844 miles on the odometer, a 3.0liter engine and the famous Ford fwd AXOD-E 4spd automatic tranny, the subject of numerous factory TSBs, recalls, and generally poor reliability record from the mid 80's through the 1990's.

Our trans failed initially at 99,000 miles in the hilly highways of hillbilly West Va.- no forward or reverse gears to be had with no pre warning or noise, leaving us at the mercy (ha!) of the only transmission rebuilders game in town-AAMCO transmissions which the Ford dealer referred us to. Leaving the next day $2490 -minus hotel in addition, lighter, we got 56 miles out of town only to have the fresh rebuilt shelf unit-tranny blow like a box of rocks in the gears, on our way out of the state . After another week of car rental and several states travel back and forth , when I picked up the car I was determined that this not happen again and asked the "professional" advice of these Aamco guys if there was anything I could do to prolong the life of these transmissions like changing the fluid more often, using any additives or using an external supplemental cooler and synthetic ATF fluid-(as I expected getting 150k or more on a motor and trans in my cars.) They unequivocally said there was not much I could do except buy an extended warranty from them at $650, for 12 months past the initial 6months I already received at $2490! Yeah sure, I only helped these AAMCO [guys] buy a second beach house and bigger boats for themselves. Never again.

Several years later at approx. 165,000 miles or so, the tranny began slip shifting hard when hot and I did a total trans flush replacing the fluid with synthetic ATF and an external cooler. This helped soothe the beastly shifting somewhat but not totally. Several famous additives and tens of thousands of miles later the intermittent hard shifting was still haunting this tranny and had to be babied. Didn't have the spare two grand plus cash for another transmission and the car was not worth a quarter of that amount at this point.

In 2005, having used Auto-Rx in two of our other cars engines, transmissions and power steering, with fair to good results, I had about 4oz left over of Auto-Rx and decided to pour it into this sorry Ford-Mercury tranny at 249,900 miles. In only 700 to 800 miles of driving -no more slip bang shifting on the 2-3 upshift under moderate throttle as before! The motor and car overall are very tired and worn , having been used as the family hauler, school beater and now again a going to work beater.

Auto-Rx, an external inline oil cooler and synthetic ATF has extended the useful life of this tranny way beyond the "normal" 60k miles the [guys] at AAMCO rebulders said this rebuilt transmission was only good for!