Marvel Mystery Oil Mystery Oil MM12R – 16 Fl Oz

Used to rejuvenate a 1965 Corvair engine. Appears to work.

Acura built a great SUV, but the engine design, though powerful and fun to drive, has a defective piston ring design that sludges the oil after about 1000 miles. So the first 1000 miles there is no oil use. The next 1000 miles uses over 1 quart. If you fail to check your oil for 3000 miles, you may find a dipstick with no oil level on it at all, not a happy situation.
I kept changing the oil every 2000 miles thinking it would clear up, but that’s not the case.
The solution, which I found in some forum somewhere (many thanks to that gentleman) is to add 8 ounces of Marvel Mystery Oil (you don’t need any more than that). It seems to prevent the oil from sludging up on the rings, as I am now at 3000 miles and have had zero oil usage for the first time in many oil changes. I also added Lucas Upper Cylinder Lubricant to help clean any issues with the valves.
Good Luck and may the force be with you.

Add a bit to a full tank of gas, replace approx 1qt in place of oil at next change. My engine runs smoother and quieter. Not sure how, not sure why. Old timer told me to give it a try and it worked well. I will continue to use it.

I’ve always wondered about Marvel Mystery Oil as I’ve seen reviews along with various YouTube videos about the benefits of this product. So I decided to give it a try. Make sure you follow the instructions on the label for the application your using it for! It doesn’t take a lot, whether adding to your oil or your gas

First I put some in my gas tank at the recommended amount (4 oz per 10 gallons). Most people do this 2 to 3 times to get the full benefits of the product. So a 16 oz bottle of Marvel Mystery Oil would treat 40 gallons of gas. It has improved the performance of my 2011 KIA Sorento 4 cylinder after using on 40 gallons and I’m going to change the spark plugs now. On my significant others 2002 Toyota SR5 4runner, we’ve had issues with 3 of the idiot lights always staying on, which I’ve read could be the O2 sensors. On the 3rd application (I used a bottle, 4 oz per 10 gallons, 4 times in a row) those lights went off and have stayed off for 3 months now! Did it clean out the O2 sensors? I’m going to say yes because they have been on for a full year!

Then I added some to my KIA’s 4 cylinder oil. You can add or replace 20% of your oil so if you use 5 quarts of oil, you could replace 1 quart of oil with Marvel Mystery Oil. I had changed my oil around 3,000 miles ago with full synthetic Castrol Edge along with using a high dollar synthetic oil filter. This synthetic oil has been so “clean and clear” that it was difficult to read the level on the dipstick. But it was like a 1/2 quart low. So I added 10 oz directly to the motor. 200 miles later, the oil went from almost being clear to black!! So it definitely was cleaning something. I drove it 300 more miles and then changed the oil and filter. I had read that you should add this product like 500 miles before your scheduled oil change and now I see why! My KIA is purring like a kitten and I’m getting 3 more miles per gallon on the highway (78 on the interstate).

Finally, I had added some (4 oz) to a 1 gallon gas container for my lawn mower and the some to the 1 gallon mixture of gas/oil for my old Toro snowblower. The snowblower had been running rough and occasionally dying on me. By the 2nd time I refilled the Toro’s gas tank, that 25 year old Toro was once again running like it did when I got it new! I’m serious here! Then this Spring (right now), it naturally was added to the lawn mower. I just got done mowing the yard for the 2nd time this year and it uses 1 tank of gas to get the entire yard done. When I went to start it up, it started on the first pull as usual. But a HUGE gray smoke cloud came out of the exhaust! And it’s never done that before. But it’s purring like a kitten too!

I’m no mechanic but am rather handy. Just installed a new capacitor on the outside air conditioner as it wasn’t cooling. And it solved the issue.

Marvel Mystery Oil says it improves compression, power, & MPG, along with lubricating upper cylinder for smoother idling along with keeping engines clean from sludge. Based off my results or experiences. I would have to agree 100%. I’ll keep adding a little to the gas now & then. But if I add to the oil, I will only due that like 200 miles before the next oil change. I recommend trying!!!