Marvel Mystery Oil53835 Synthetic Motor Treatment, Removes and Prevents Sludge Build Up and Leaks, Increases Life of Engine, Extends Oil Change Intervals and Mileage, 16 oz. (Pack of 1)

It's good for cars I use in my jeep it breaks up sludge 👀

I added this at the oil change and seems to improve the performance also added the other mystery oil product which in my opinion saved my motor since I own the worst engine Dodge has ever produced the 2.7 garbage!

I am giving Marvel Mystery Oil 5 stars partly because of its rep earned over many decades. There are enough people that swear by it to give it tacet credibility. When I just replaced the electronic fuel pump in the Mercedes at 170,000 miles, that made me think that some lubricant in the gasoline was in order. No doubt I read it, as well. It looks to me that Marvel Mystery Oil is mostly automatic transmission fluid. I suspect they have added some other additives. After all these years, somebody would have figured that one out if they were only using ATF. Since I don't have to add very much to the gasoline, I can afford it. In my diesel, I add ATF, since I add more.

Her truck had loud lifter tick from the Stupid "Active Fuel Management" (AFM) system and she was terrified it was gonna blow up quit driving it...It has a mechanical damaged issue and probably still does. But it also happened to be way over its mileage limit per oil change and low... I changed the oil. And added this and it immediately quieted down within 20 min. So probably NOT fixed BUT she can and is driving it.

I loved it.This product is absolutely one of the best a lot.More people should be using it.I have used the fuel treatment and the oil treatment.And I have three hundred and thirty five thousand miles on my vehicle

Been used for many years by mechanics, race car drivers etc. I put 4 oz in the oil to quiet noisylifters

My SUV runs smoother & quieter on the local & freeway driving. I highly recommend this product to friends & family.

I have used this in all my vehicles with great results for years.....