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  #1  
Old 10-23-2003, 09:36 AM
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Marvel Mystery Oil...good or bad?

Has anyone ever used this stuff with any success? or is it just snake oil? It claims to do the same stuff as the other diesel additives. Thanks in advance.
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  #2  
Old 10-23-2003, 09:50 AM
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Atomic 4 sailboat engine owners swear by it as a fuel additive to keep the valves from sticking.
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  #3  
Old 10-23-2003, 09:52 AM
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i worked with a guy who was a diesel mechaninc by trade and he used to use it on the garbae trucks? he said it was good stuff.
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  #4  
Old 10-23-2003, 11:03 AM
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Marvel Mystery Oil, Slick50, engine restore, etc... They are all snake oil to me. Stay away from EVERYTHING that has Teflon (Also called PTFE) in it that ends up in crankcase oil or fuel system. Teflon is not made for automotive engines.DuPont even refused to sell PTFE to companies like Slick 50 because of that very reason. It's only because of a court order that DuPont still sells it to them.
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  #5  
Old 10-23-2003, 11:04 AM
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I wouldn't say that it does everything that the "other" diesel additives do, such as raising the cetane level a bit or preventing algae in the fuel tank, but it does have some benefits.

My experience with a little-driven '82 300D that had gummed-up rings, etc. was that Marvel Mystery Oil freed up the rings and in doing so increased compression and generally smoothed out the engine. It also needed a new timing chain and valve adjustment that provided instant improvement, but the addition of Marvel Mystery Oil gradually brought the rest of the engine back to its proper form.

For both my diesels, I always add 3-6 oz of Redline Diesel Fuel Catalyst at every fuel fill-up.

Rather than "snake oil", MMO is a good solvent to keep things from gumming up. Just my $.02.

Cheers,
Wes
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  #6  
Old 10-23-2003, 11:45 AM
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Stuff like that usually won't hurt anything and some of them actually do "work" to some extent. I wouldn't be adding anything with teflon or stuff like that however. I would be more inclined to use something like Lucas or PowerService before MMO but that's my preference.
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  #7  
Old 10-23-2003, 12:12 PM
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I have a friend (I know it's hard to believe) who has used the product in his E320 for the entire 250,000 miles at a ratio of one quart at each change interval.

That information aside: Mystery oil is widely used to lubricate air tools; has been for as long as I've been alive, and it's what I run through my tools. My $0.02
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  #8  
Old 10-23-2003, 12:48 PM
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I think you folks need to clarify whether you're talking about mixing it with the oil or the fuel. It can do either.

Mixing it with engine oil is probably not a good idea, as it might adversely affect the additive package. In the fuel sounds fine.
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  #9  
Old 10-23-2003, 01:12 PM
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Quote:
Originally posted by Antony
Mystery oil is widely used to lubricate air tools; has been for as long as I've been alive, and it's what I run through my tools. My $0.02

I think a Diesel engine is a bit diffrent from an impact wrench or an air drill

Last edited by 82-300td; 10-23-2003 at 02:24 PM.
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  #10  
Old 10-23-2003, 07:04 PM
rhgtara@localne
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I have a 1993 300SD. About 3 yrs. ago my wife became ill and
I was unable to go any farther than the local stores as I had to
spend all my time caring for her. The result was this recent
summer the engine sounded like a dozen men with sledge hammers were inside trying to get out. I then put 1 1/2 qts. of
Marvel Mystery oil in and took it on a run through the hills in 2nd
gear running up to 5000 RPM's. That really helped and with more high RPM running the engine is almost as quite as when new.
The oil must be hot to be effective.
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  #11  
Old 10-23-2003, 07:49 PM
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quote:
--------------------------------------------------------------------------------
Originally posted by Antony
Mystery oil is widely used to lubricate air tools; has been for as long as I've been alive, and it's what I run through my tools. My $0.02
--------------------------------------------------------------------------------




I think a Diesel engine is a bit diffrent from an impact wrench or an air drill

You failed to post the precurser: "that information aside"!!!
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  #12  
Old 10-24-2003, 12:43 PM
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This site gives a pretty interesting explanation on additives, some of which he refers to as "mouse milk":

http://www.mccallhitch.com/farlow/articles/farlow3/farlow3.htm

It seems to somewhat support the use of Marvel Mystery Oil, although not specifically in diesel engines.
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  #13  
Old 10-24-2003, 09:36 PM
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It's a water displacing oil very good for air tools.......
William Rogers.......
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  #14  
Old 10-25-2003, 02:10 AM
123c
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I personally use Power Punch. That stuff is the best, and never had a problem with it. Everyone in my area swears by the stuff, as well as the Lucas products...
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  #15  
Old 10-25-2003, 07:15 PM
Calvin Peterson
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MMO was first used by the U.S. Navy for their submarine diesels in World War ONE. And the formula hasn't changed. I've used it for 32 years in my diesel fuel (Frank King gave a terse reply to my question to The Star as to wether or not to use it in the oil!). Use it in my 230/8 also. Never a carb problem.
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Old 10-25-2003, 07:15 PM
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