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 1/2 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