I hate to break the news to everybody but this product is nothing but SNAKEOIL. It does not do anything for your engine, all it does is empty out your wallet.
You can forget about this product cleaning up any sludge, you can Google a thread called ( 3 ARX cycles, didn't do much, bummer.. It will also not do anything for VARNISH and it does not work in Aluminum Engines, the proof is in a thread that you can GOOGLE called ARX & Aluminum Engines. This product was a site sponsor on BITOG from 2002 till 2009, they got kicked off as a sponsor because 99% of the members who used the product saw no results. When they reported that they did not get results the owner of arx claimed they did something wrong and that they should purchase more auto-rx. The stuff costs $28.00 for a 12 ounce bottle of the junk. It is composed of Lanolin Esters that have very limited cleaning abilities and many members have gotten better results using a HM Oil, Pennzoil Platinum, and even Mobil 1. There is a thread called Mobil 1 better cleaner than Auto-Rx ?
There are about 5 members on BITOG who will claim that auto-rx works, problem here is that they are paid represenatives of the company, you can read about this in a thread called Paid Posters For Auto-Rx. On BITOG there are 40 LOCKED AUTO-RX THREADS, if the product really worked then there would not be so many locked arx threads and they would not need PAID POSTERS. You see, a snakeoil salesman needs accomplices to push his product since the SNAKEOIL SALESMAN has no credibility.
Things are so bad for auto-rx that they went ahead and changed the name of there product to Auto-Rx Plus, same product, but a different name. When a product has a terrible reputation or it is not selling then the owner will change the name of the product. There was a member on BITOG who tested auto-rx plus and showed before and after pics, he now calls the product AUTO-RX MINUS. He actually tested auto-rx and got no results, so the owner gave him 2 FREE BOTTLES OF AUTO-RX PLUS to try out, his thread is called Sneak-peek @ Auto-Rx Plus cleaning after 1400 mi and his thread where he used the old arx is called Auto-Rx results-Part Three- AFTER PICS.
This product used to have a money back guarantee, but a few months ago the owner GOT RID OF THE MONEY BACK GUARANTEE. Anytime you want to use an oil additive to try and clean up your engine it is important to do your research and ask people who have actually used the product.
Auto-Rx claims it cleans sludge, but there is no proof and many threads prove otherwise. The owner has also admitted that his product has a hard time removing Varnish. The only way to remove Varnish from your cylider heads or cams is to have them professionaly cleaned. Arx also claims that its product is safe for turbos, yet auto-rx breaks things off into chuncks and a few users have destroyed there turbos. Arx will claim that there product can stop oil leaks by rejuvenating seals, there is no evidence that this product rejuvenates seals. When arx users complained that there leaks did not stop, the arx owner said they probably had a ripped or torn seal. If you have a seal leak, then you are better off with a HM oil. ARX claims that its product can stop oil burning by cleaning the ring packs, maybe on a vehicle that has had proper OCI's and there is not much junk in the ring packs. If your ring packs are crudded up bad you almost need to take a hammer and chisel to get the rings free. Auto-Rx will claim that it has tests, but the problem here is that the people who did the tests were given free product and these people were on the arx payroll.
Arx has been in business since 2002, and they have 1133 people who have tried the product, but almost all of these people are onetime customers, 2012 was a really bad year for arx since they only picked up 18 customers. You might ask why this product is not sold in any auto parts stores, it would be to expensive and with today's oil's being better there really is not a need for this product. The arx forum is basically the owners blog, his name is Frank Miller, almost every thread has been started by him. This person will say anything to you when you call and promise everything under the sun to get you to buy his product, but once you call back and complain that the product did not work he will make every excuse under the sun.