Basic Application for Gas Engines | Diesel Engines | Transmissions | Motorcycles | Power Steering | Differentials | Seal Leaks | Get Started with Auto-Rx® Plus | Fast Track | FastTrack for Sludge 

After Auto-Rx® Plus has done its powerful cleaning and restoring action, you will be amazed with your transmission’s performance! 

Our product will restore your seals and so effectively remove contaminants that your transmission will be returned to like-new condition! Auto-Rx® Plus can:Enter your page blurb title here...

• Prevent or delay costly transmission repairs. • Dramatically increase the life of your transmission.
• Improve overall transmission performance.



Heat and Contaminants: A Transmission’s Greatest Enemies

It is scientifically proven that every problem that occurs in a transmission (other than manufacturing defects) is caused by contamination- the same as in an engine. Contamination is the number one cause of transmission trouble! Why? Because it creates uneven hotspots. And the contamination process has already begun within the first 10,000 miles. Some symptoms of transmission failure include slippage and difficulty or inability to shift. That’s why it’s recommended that you clean your transmission at least every two years or after 25,000 miles.

Removing this contamination is critical to the life of your transmission. First, this contamination interferes with the operation of your transmission’s valve body (which regulates shifting). Second, the internal seals dry out and become compressed. This compression creates pockets where the seals do not make contact, and it results in a loss of internal pressure.

Auto-Rx® Plus is your solution. Auto-Rx® Plus works as you drive. Contamination residue and build-up are liquefied and gradually removed by the transmission filter, cleaning the internal mechanism of your transmission. Select one of the links below that will have Auto-Rx® Plus working for you in no time!

What to Do with the Leftover Product?

After using the required dosing for your transmission, some Auto-Rx® Plus product remains in the bottle. Suggestions for using this remainder include cleaning the power steering (2 ounces) or installing an Auto-Rx® Extended Protection dose (4 ounces) in your engine crankcase to get some measure of engine cleaning. NOTE: This is not for engines with sludge.

Transmission Repairs

Replacement of the torque convertor is something Auto-Rx® Plus can prevent. In most cases, folks use Auto-Rx® Plus after the fact to correct a sick transmission. Very few folks actually service their transmissions at the appropriate time based on the fluid life. Many transmissions could be saved with Auto-Rx® Plus. The biggest problem is that the manufacturers suggest a transmission fluid exchange from 60-80,000 miles. That is far too long under normal driving conditions.

It is very simple to invest in a bottle of Auto-Rx® Plus and add half the bottle to the existing fluid at about the 30-40,000 mile mark, drive for 1,000 miles and change the fluid, then use the remaining half of the bottle at the 70-80,000 mile mark for a second change of fluid. In all likelihood, the transmission would never have a problem.

Manual Transmissions

To get the most out of Auto-Rx® Plus, we recommend the following method of use. The application will last for the life of your manual transmission:


Add 1 ounce of Auto-Rx® Plus per quart of oil.


Drive 1,000 miles for vehicles driven routinely in high mileage situations, or 3,000 miles for vehicles in harsh conditions, such as dry and dusty with extreme heat.


Drain the Auto-Rx® Plus and oil. Refill according to vehicle manufacturer’s recommendation.

Automatic Transmissions

Automatic transmissions are generally not properly serviced over a vehicle’s intended life. For this reason, transmissions get a bad rap as being the weak link in the drive train. Repairs are generally very costly, usually starting at over $2,000. Owner manuals put fluid exchange intervals as high as 80,000 miles, but a transmission repair shop will seldom recommend running the fluid for more than 30,000 miles. So who would you believe? If you have more than 30,000 miles on your vehicle, we highly recommend adding the prescribed dose of Auto-Rx® Plus and driving 1,000 miles for ordinary driving conditions or 3,000 miles for harsh conditions (see Step 5 below) before a fluid change. This will ensure that deposits, gums, and varnishes come out with draining. Don’t put fresh fluid into a gummed-up system. A single treatment is all that is needed.

Harsh Conditions:

On automatic transmissions that have been poorly maintained and have had severe duty (such as towing or carrying large payloads), gummed up deposits will be heavier than the normal passenger car under light duty. Therefore, it will take longer to clean up these deposits in the torque converter and shifting module valves. However, in 99% of applications, adding 6 fluid ounces of Auto-Rx® Plus and running 3,000 miles are all that is required to clean up an automatic transmission. Most shifting issues and overdrive chatter are resolved in 3,000 miles. After completing the run time, you merely need to service the filter screen and/or magnet before purging out the old fluid with new. There is very little filtration on most transmissions, so there is no reason to run the dirty fluid any longer than necessary.

Instructions for Automatic Transmissions

When using Auto-Rx Plus to clean an automatic transmission, we will be adding Auto-Rx to the existing transmission fluid. This is different from using Auto-Rx Plus in a motor cleansing. The reason is simple, the transmission is a closed system so the deposits are much more easily dissolved. Whereas the deposits in a motor are far more complex from fuel, air, moisture, dust, etc.

For most passenger cars with a transmission fluid capacity of 4.5 to 10 quarts, add 6 fluid ounces which is ½ bottle of Auto-Rx Plus to the existing transmission fluid. Then drive for 1,000 miles before having the transmission replaced. All gummed deposits in the torque converter and shifting valve modules will be dissolved and suspended. Why put fresh fluid in a dirty transmission?

For heavy duty trucks or vehicles with a capacity of 12 quarts or more, we recommend running a full 12 fluid ounce bottle of Auto-Rx Plus to the existing fluid and drive 1,000 – 1,500 miles before changing out the fluid.

To read a letter from a customer about Auto-Rx succeeding where MMO and Lube Guard failed in his transmission, CLICK HERE.


Regular Price $21.95 Per Bottle