There are 3 cars I maintain. I have an '87 turbocharged Buick Grand National and an '02 PT woodie. After reading about Auto-RX I wanted to give it a shot in my GN since I try to give it any edge possible. After using Auto-RX in the engine, I noticed very little difference. It didn't surprise me since I maintain it very well and it never really used much oil anyway. It always has had Mobil 1 oil changes, roughly once a year since it isn't driven that much. The car has 80,000 miles on it currently.

After the treatment though I remember testing it to see how it was under turbo boost. It seemed to be laying down serious torque at only 12 pounds of boost; the type of feeling I was more accustomed to when it was full throttle at about 15 pounds or more. I don't know if was my imagination but it would seem more than reasonable from compression results people have gained with Auto-RX.

My PT cruiser is pretty new with low miles but I did an Auto-RX treatment at 10K miles just to make sure it was really clean and ready for when I start Mobil 1 and longer drain intervals. I will say this though; I get way better mpg than most anyone on PT forums seem to achieve.

The third car that I maintain, which is my dad’s ('97 Dodge Caravan - 3.3 liter), is the one that really showed me that Auto-RX can do what it says. Regrettably the Caravan went on a nearly 7,000 mile oil change with dealer bulk oil. I'm guessing it was 5w-30 but I have no way to know. It's a long story as the van has always had Mobil 1 oil changes by me, other than that time and the first few initial changes. Anyway, after that it started using a quart of oil every 1,000 miles. After putting up with that for a few years I put some Auto-RX in. At about 4,000 miles into the RINSE cycle it all of a sudden stopped using oil. It was wild. It now uses about 1/4 to 1/3 of a quart every 1,000 miles.

For the first 4,000 miles of the rinse I kept checking the oil and had to put in close to the "pre-Auto-RX" quart every 1,000 miles. I figured the engine was too worn or Auto-RX just wasn't doing what it says it could do. Then after the 4,000 rinse miles, I'd keep checking the level and it wasn't going down. It's stayed that way for what is probably 40,000 miles or more. The Caravan now has 155,000 miles, never had ANY engine work and I do 14,000 mile changes with Mobil 1. Believe me, up until the reduced consumption at 4,000 miles in the rinse cycle, I was seriously doubting Auto-RX. And it's nice to know Auto-RX is paying for itself quite quickly without having to add nearly as much top-off oil.

Because of these results, it is the reason why I had no hesitation using it in my PT despite knowing very well I may not see any seat of the pants differences.

Since I saw such good results trying Auto-RX in my engines and having read about peoples positive results using it in auto transmissions, it was time to give it a shot in my GNs' original trans. For several years it has been feeling vague and soft between shifts when the car is floored. Keep in mind this car is about 370hp and 475ft lbs of torque SAE net. It did a 1/4 mile in 13.03 seconds on REAL street tires in 80 degree weather.

A few years ago I put some Lubeguard in the trans thinking I would for sure feel some sort of difference, even if minor, with the claims they make. But I didn't.

I still had some Auto-RX left over, so I did a drain and fill(I have an aftermarket pan on the car with a drain plug - it's the only non-factory installed part on the original trans) to get some of the Lubeguard out. I know Auto-RXs' instructions don't recommend having competing esters and di-esters present. After I put Auto-RX in, it wasn't very long at all before the shifts at full throttle definitely felt more positive, direct and less vague. Quite a bit enough for me to put off what I though was going to a rebuild by choice to get some more positive control to back the power the engine puts out. What seems amazing too is I used the recommended 6 ounces which seems like too small amount to do anything.

And again, more money Auto-RX is saving me not having to do a rebuild. I do realize with that kind of power behind an original 1980's trans, a rebuild is inevitable at some point, but at least for now I can budget my money on other things.

Hope this helps with anyone wondering about Auto-RX and if it's really possible that it is able to do what it's supposed to do.

KP