Hi guys,

I've been putting Marvel Mystery Oil (MMO) into my engine oil at each Oil Change Interval (3000 miles on the 240D).

I'm not doing any kind of oil analysis, but my 'shade-tree mechanic' sense tells me that my oil filter is MUCH heavier than it usually is, and certainly when I am cleaning up spilled oil (I'm using Chevron Delo 400LE 15/40 from Costco) the used oil (that is mixed with the MMO) cleans up really nicely. That is, it seems to wipe up from surfaces without leaving a whole lot of black oily mess.

I'm hoping that this means that the MMO is keeping the insides of the OM616 cleaner, and that it is slowly removing 30-year-old combustion residues, etc.

Have any of you had long-term experience with MMO in the motor oil, or have you done oil analysis with MMO in the oil?

I'm just curious as to long-term use and/or some kind of analysis that would tell me this is a good idea.

Sincerely,

Packman

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83 240D - 4 speed manual - Manilla Beige
189K miles, Tachometer mod, cool wooden shift knob from PeachParts, CocoMats, Original factory paint, manual windows, manual sunroof. Starting to add AudioWrap to this car too!

I'm not to keen on adding MMO, or any additive to the motor oil. Motor oil already has detergents in it, and you are thinning it with the MMO, so depending on how much you put in the viscosity will be changed.

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1977 240D turbo

X2
its not good practice to add all these things. If they were needed they would already be in the oil formulation.

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Grumpy Old Diesel Owners Club group

I no longer question authority, I annoy authority. More effect, less effort....

1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving

The MMO thins out the Oil and might interfere with the chemical Mechanism that makes Multi Viscosity Oil Multi Viscosity.
Diesel Engines are harder on the Oil that a Gasser is.

In the Past when MMO first came out there was no Multi Viscosity Oils. It did not matter if you put a bit of MMO in 30wt Oil and thinned it a little; and the older Oils did not clean as well as the more modren ones do.

If you want a cleaner Engine innards You could switch to synthetic Oil.

If you want less Engine wear from particles You could install a Bypass Oil Filter.

Concerning the subjective weight of the Oil Filter. You have assumed the weight is unwanted crud; how do you know the weight is not made up of tiny Metal Particles from increased wear on the Metal Parts?

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84 300D, 82 Volvo 244Gl Diesel

Without actually weighing the filter before and after I don't see how you could tell anything by "feeling" the weight of it. Of course a new dry filter is much lighter than one full of oil or at least soaked in oil.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

keep in mind, the amount of time you take after you pull the lid off the filter can will have a great affect on the weight of the filter...

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

The mmo is a moderatly strong solvent. Since you have been using this practice for some time the engine internally is probably as clean as it is going to get. So no benefit likely by continuing.

You could put a quart in the fuel tank with a fill up to clean out your fuel system now for awhile. Make sure to carry extra fuel filters and the tools to change them though just in case a lot of junk is loosened up.

Since I cannot see the by products of combustion actually weighting more than oil. Although perhaps they could. I might assume their accumulation in the oil filter is reducing the ability of the oil to flow out of the filter as fast as a less unobstructed one would when changing it. So more oil is retained in the filter much longer and it seems heavier .

This is just a guess at best but at least some hope for your feeling the oil filter seems heavier since you started using the MMO in the base oil. Some engines are indeed crudded up internally pretty bad.

There was an article written in 2007 praising MMO for iyts cleaning ability but it actually made ULSD more abrasive than the 520 micron scarring that typically happens!

It's a great cleaner in the fuel and to clean upper rings, but PLEASE be careful about adding it to the fuel.

The best cheap alternatives that were effective were the equivalent of 5% biodiesel mix per tank to the fuel and lubricity additives to the oil

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Strelnik
Invest in America: Buy a Congressman!

1950 170SD
1951 Citroen 11BN
1953 Citroen 11BNF limo
1953 220a project
1959 180D
1960 190D
1960 Borgward Isabella TS 2dr
1983 240D daily driver
1983 380SL
1990 350SDL daily driver alt
3 x Citroen DS21M, down from 5
3 x Citroen 2CV, down from 6

My 240D owned since new - 350,000 miles with 5000 mile oil changes using a diesel rated dino. No additives to the engine oil ever AFAIK. Oil analysis done a few times with good results.

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Len
'59 220S Cabriolet-SOLD and living happily in Malta
'83 240D 351,500 miles original owner-SOLD
'88 560SL 41,000 miles - totaled and parted out
https://sites.google.com/site/mercedesstuff/home
'99 E300 turbo 227,500 miles
'03 SLK320 40,000 miles - gave to my daughter
'14 Smart electric coupe 28,500 miles
'14 Smart electric cabriolet 28,500 miles
'15 Smart electric coupe 28,000 miles

I'm confused as to why you would want to add a solvent to your oil. If the oil isn't sticking to the concrete, I wonder how well it's sticking to the metal parts its supposed to protect?

I think you're going backwards with MMO in your oil.

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1981 300TD "The Green Lantern"
1980 300TD
1983 300D Euro "China Cat"

I purge with MMO

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt

I couldn't resist this one.
There is a difference between; Saying I purge my Fuel System with MMO and saying I purge with MMO (ouch!).

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84 300D, 82 Volvo 244Gl Diesel

purge my injectors and IP. with Marvel Mystery Oil.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt

How, you run it from a separate container or add it to the tank at set intervals? I have never heard of someone using it for that.

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22

The only reason to add MMO to the oil is for cars with hydrolic lifters. I've used it with sucess in my dads Challenger when it had a valve tap. The thinner oil and the deturgents work well for this. On our mercedes engines, I don't see any reason to put it in the oil. Maybe put in in the fuel, but not the oil.

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