How to Add Marvel Mystery Oil to Transmissions

Marvel Mystery Oil is an additive that was fist sold in 1923 through the Marvel Oil Company. It was created to clean the carburetors in engines made after World War I, as they would easily get clogged. The gasoline at that time was low-grade and would often coat the carburetors with lead deposits or other contaminants. In addition to cleaning, Marvel Mystery Oil also increases gas mileage, decreases engine wear and improves overall performance. It can be safely added to automatic transmissions to clean deposits and reduce wear.

Things You'll Need:

• Funnel
• Rag
• Measuring cup
• Automatic transmission fluid drain pan
• Car owner's manual

1. Pour the amount of Marvel Mystery Oil you are going to use into the measuring cup

Pour the amount of Marvel Mystery Oil you are going to use into the measuring cup. Up to 16 ounces may be added to an automatic transmission. In smaller cars, 10 to 12 ounces should be enough.

2. Drain the same amount of transmission fluid into the pan

Drain the same amount of transmission fluid into the pan. For example, if you are going to add 16 ounces of Marvel Mystery Oil, drain 16 ounces of transmission fluid. Refer to your owner's manual if you not sure where the drain plug is.

3. Open the hood and remove the cap from the transmission fluid cylinder

Open the hood and remove the cap from the transmission fluid cylinder. Place the funnel into the hole.

4. Pour the Marvel Mystery Oil into the transmission

Pour the Marvel Mystery Oil into the transmission. Replace the cap, making sure it is on securely, and close the hood.

5. Start your car and run your engine for 20 minutes or so

Start your car and run your engine for 20 minutes or so. This will warm up the transmission fluid and give an accurate reading when you measure it with a dipstick.

6. Let the car cool down for a couple of minutes

Let the car cool down for a couple of minutes. Open your car hood and remove the dipstick from the transmission. If you are not sure where it is, refer to your owners manual. Make sure it is not the oil dipstick.

7. Wipe the dipstick clean with a rag and then re-insert it

Wipe the dipstick clean with a rag and then re-insert it. Pull it out again, and check if the amount of fluid reaches the "full" level marker. If for some reason it is low, refill the transmission with some of the drained transmission fluid. Make sure not to overfill it. Repeat this process until it is full.

8. Put the dipstick back into place

Put the dipstick back into place and close the hood.

Warnings

Don't use an oil pan to drain the transmission fluid. If there is leftover oil in the pan, it will contaminate the transmission fluid.

Marvel Mystery Oil should not be added to cars that are powered by methanol.

Video: Marvel Mystery Oil information

Comments on this video:

• When I was approximately 12 yrs old, My Dad was given a 1946 Hudson Pickup Truck which has a small 6 cyl. engine in it that was seized up from not being used for so long. So we towed it home and My Dad took out the spark plugs and poured MMO into each cylinder and let it set for 2 weeks. After two weeks we tried to turn it and sure enough...... it did. Amazing stuff.
• I use it in my 96 Polaris SL780 with 305 hours and my 04 Maxima with 226K miles. The jet ski would always start hard and wouldn't idle unless you held the gas a little bit. This mmo has made it run so much smoother with better response and it will actually stay idling. It also makes the VQ35 in my Maxima much smoother, from idling to redline and everything in between. I get about 2-3mpg better when I use it in my gas as well.