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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$500 1982 240d owner "Gunter"
125k miles,4 speed manual
crank windows, MB Tex, all original
no a/c, daily driver
Scorecard so far....
$230 Maaco paint job
$27 dimmer switch, $40 shutoff valve, $45 brake MC, $260 calipers, $40 brake hoses, $40 side fender trim, $20 balancing, $109 lifetime alignment, $10 fuel return lines, $115 oil&fuel filters for next 30k miles

Atomic 4 sailboat engine owners swear by it as a fuel additive to keep the valves from sticking.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

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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'73 VW camper
'80 300td wagon

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.

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

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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1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k

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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2014 Smart Electric 20K

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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Rick Miley
2014 Tesla Model S
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Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro
Chain Elongation References

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

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.

quote:
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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
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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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1992 500SEL 25K
1995 E320 40K
1995 SL600 120K
2002 JX8 Sport 43K
2005 Volvo S40 95K
2006 Isuzu NPR 304K (Frankencamper)
2007 Crown Victoria 150K
2014 Smart Electric 20K

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.

It's a water displacing oil very good for air tools.......
William Rogers.......

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...

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.