"My fiancée’s car (1991 Honda Civic DX) began to get a very bad rough idle about 6-8 months ago, so I began to add some Marvel Mystery Oil (MMO) in the oil for a few oil changes. At that time the car had 101k miles on it. The idle got a little better after the MMO treatment but it was still nowhere as smooth as it use to be about 3 years ago. The idle was getting so bad that when the A/C kicked on while the car was in gear sitting at a light, the whole car would vibrate/shake. I changed the plugs, wires, distributor cap, PCV valve and checked for vacuum leaks. The car would also burn about 1 quart of regular non-synthetic motor oil every 2,500 - 3k miles.

I heard so much about Auto-Rx (ARX) on Bob is the oil guy and how well it worked. I have worked on cars and built engines for about 15 years. I have always used MMO with great success in the past, and I was very skeptical to try something "new", even though ARX was talked so highly about. I did not think MMO was going to correct the rough idle any better, so I decided to try ARX. Before I began an ARX clean phase, I looked inside the oil filler hole and noticed a lot of varnish on the base of the head and the rocker arms. I also noticed some minor oil deposits on the valve springs. Keep in mind, I had used ½ of a quart to1 quart of MMO in the engine for 6k-8k miles already (2 oil changes).There has never been an accumulation of heavy sludge inside the engine.

I am 2,500 miles into the first rinse phase. I recently looked inside the oil filler cap and noticed a lot of the varnish was gone and just about all of the small oil deposits on the valve springs were also gone.

The oil consumption is down to just under ½ a quart with 500 miles to go in this rinse cycle. I believe ARX has cleaned around the ring packs to reduce the oil consumption from 1 quart to ½ quart and the MMO failed to clean the rings. I still have one more clean/rinse cycle to go and I very pleased with the results I have seen thus far. I am going to give up using MMO in my engines and stick with ARX because it has proven to me beyond any doubt to be far superior than MMO. "

Feel free to post this on your site. You have my full permission and I have no problem with that.

It is 2:30am and I just got home from work a little while ago. Once again, thank you for making such a great product of ARX. My father lives in Jacksonville FL and next time I get up there, I am going to begin his 1999 F150 on an ARX clean phase because it is begining to use oil.

Jason