Marvel Mystery Oil

[Nick in Fayetteville]

Is anyone adding Marvel Mystery Oil to the coolant in their radiator? If so, how much? I have heard that it keeps rust down and lubricates the water pump.

 

[51504bat]

I've heard of using MMO in the oil and gas tank but never in the radiator. IMO there are better commercial water pump lubricants but that's JMO.

 

[J Franklin]

Buy waterpump lube for radiators and use that in the radiator.

 

[TerryH]

First time I’ve ever heard of that one………

 

[Certimafied]

I bet it would work as a rust inhibitor, just wonder if it would do anything to the rubber hoses? Regular oil would attack the hoses eventually, not sure about Marvel Mystery Oil though.

 

[CWPASADENA]

Do not use MMO in the radiator. Use a water pump lubricant or water soluble oil.

Chris W.

 

[Big hammer]

Is anyone adding Marvel Mystery Oil to the coolant in their radiator? If so, how much? I have heard that it keeps rust down and lubricates the water pump.

Don’t think it would mix with water, if your using ant-freeze why would you add it

 

[ETAModel]

Dad always said MMO would fix anything from a Ferris Wheel to a Broken Heart.... but this is a new one for me. I too am wondering how it would react with antifreeze.

 

[Werner]

Hi Nick,


MMO is a thin white oil with detergents. It is not soluble in water. When it comes in contact with glycol (radiator antifreeze) it will result in muddy breakdowns. Ergo: Yes for the gas tank, never in the radiator!

 

[Dino's A]

Never put MMO in the radiator. Distilled water & soluble oil. Or coolant if
you choose. I only put some MMO in the gas tank to give it a light coat
of oil to help keep rust at bay.