Marvel Mystery Oil 53436 Motor Treatment, Engine Oil & Fuel Treatment Additive, Cleans and Lubricates Fuel System, Prevents Leaks, Improves Engine Performance and Fuel Economy, 48 oz. (Pack of 2)

Have been using this product for since the 70's in every fuel operated piece of equipment I own. Gas or oil and have never had an oil or gas related issue in anything I use it in and when I saw the 2 pack on sale, I bought 2 because I use this all the time from my cars oil and gas and weed eater, blower, generator and power washer. Amazing Stuff!!

I just started using this because my friend has always been able to keep old cars running perfectly forever. She finally told me her secret was Marvel Mystery Oil. She puts about 2oz in every other gas filling + in the oil with every change and her old cars have always run perfectly. The 2005 Dodge Caravan she just gave me has about 260,000 miles on it and it shows no sign of slowing down. I've taken it on long road trips and it runs like a champ. Highly recommend!!

Add to gas tank to lubricate fuel pump, fuel injection system. This makes a great top end lubricant too! ADD AROUND 6 ounces to 10 gallons of gasoline or diesel fuel for best results. This will extend the life of your engine. You can also add this to crank case oil in older vehicles. New engines require very specific motor oils and viscosities so I don’t recommend adding it to late model cars and trucks crankcase oil.

Good stuff. Used on Model A that has been stored for 5 years.

Great product to periodically add to your car's gas tank to clean out the gas lines and keep your car running smoothly

I’ve been using this in vehicles (and other lubrication applications) for 40 years. Adding it to oil (1) makes the oil thinner for the mechanics to work through, so it is great for cold weather lubricant addition; (2) it doesn’t break down, so it makes your oil far more efficient for a long term; and (3) you will sense your engine running smoother immediately. It is so efficient!!! Last, I have used this for firearm lubrication in extreme cold weather, as an example of the effectiveness of its use. I’m a huge, long term fan of this!!!

I've used this for at least 50 years. I use a 50/50 mix of MMO and Sta-bil in the fuel tank of everything I own that runs on gas. Vehicles, mowers, motocycles, equipment, etc. Keeps the fuel fresh and from sucking up atmospheric moisture that leads to poor combustion. I also add 8oz at every oil change in my all my 4 wheel vehicles. Everything runs much smoother than without, is more efficient and I've had the same Craftsman push mower for more than 15 years. I think this and Shell Rotella T6 motor oil are some of the best products out there for keeping your stuff running well and to last longer. Well worth the effort!

5/5 recommend! 2009 Toyota Camrys are known for having an engine that clanks and just kind of sounds rattly. Followed the directions, ish, and added to the oil and fuel and within about 30 minutes of driving, the engine sounds seemingly disappeared and began to operate smoothly. I purchased two larger bottles because I intend to add this product to my other vehicles together with my lawn care equipment.