Part 1: Does the Marvel Mystery Oil trick REALLY work to raise low compression?

In this video, I share the story of how we used the "marvel mystery oil trick" to raise compression on a motorcycle about to head to the junkyard! Learn what we did and how this old beloved trick saved the day! This is part 1 so stay tuned for part 2 after some miles. Watch that video here:
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Keep Wrenching,
Shane Conley
Instructor/Motivator/Motorcyclist
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[jackoneil]

Interesting result. Having been an aircraft dealer I tested MMO on several high-time air-cooled aircraft engines and a couple of 470 Cu-in Aircraft engines on twin engine Beechcraft B55 Baron that had been run at low-power cruise for several hundred hours and had developed excessive ring leakage and all 6 cylinders were essentially un-airworthy aat below 50psi on an 80 psi leak test at TDC. As a test on one engine I added about 10% MMO to the engine oil and 10% Rislone to the other engine and in about 3 hours of normal operation, cly leakages on the MMO engine came up to 55 to 60PSI over 80, and on the Rislone engine, all leak pressure were up to between 60 to 70 psi. after 8 hours the MMO engine pressures were in the high 60 to mid 70's, and the Rislone engine, all cylinders were in the high 70's. Cutting the oil filters on both engines showed a large amount of fine carbon in the MMO engine and a concerning amount off larger chunks of carbon in the Rislone, some of which were semi-circular. I went on to run both engines with the MMO and Rislone for about 25 hours and The Rislone engine developed pretty excessive oil leaks on the crankcase mounting surfaces. On tear down for Overhaul the Rislone engine was noticeably cleaner than the MMO engine, espicially around the piston skirts and piston rings. The MMO engine piston rings still had a lot of carbon build-up.

In retrospect, Risone was much more effective but I think too aggressive for aircraft use. Neither Rislone or MMO are approved for use in Aircraft engine oil.

[twcaldwell]

I add a quart of MMO to every tank of fuel in my powerstroke ford diesel, the truck has 299, 000 miles on it, still has OEM injectors and runs like new. I have used marvel mystery oil for the past 40+ years and I think it is the best thing since sliced bread.

[machia]

Magically marvelous!
My Ford truck just hit 345, 796 miles .
I use a qt with every oil change and 4 oz occasionally when I fill up at the pump . Not even a tick in the engine !

[hardlymovingpro]

Really good video but can't believe all the negative comments! MMO is also great in the crankcase for cleaning up sludge build up on the valve train components for OHC engines. Takes around 6K miles and perhaps a lot of low mileage oil filter as well as oil changes (oil gets dark pretty quick).

[tonycolca]

The two main benefits of mmo is keeps rings from sticking and allows motor oil get to where it needs to be to properly lubricate engine

[whoanelly-]

MMO is simply magic. I use it in all my engines and have found that for top end maintenance once a year. I do a "cylinder enema", I bring the cylinder to TDC, then using an adapter for the spark plug which has a clear line and valve, I overfill the cylinder (excess goes into the clear line) so as to flood the cylinder and valve faces. I slowly rock the crank a few degrees and let it sit overnight. I then drain and install a clean plug and repeat for each cylinder. From sticky valves to stuck rings it works great a cleaning out the sludge.

[dkruitz]

I would definitely like to see the compression ratio after having run the bike for a half hour or so. But it's nice to see some measurable differences with a product that are not just anecdotal in nature.

[DickiMonster]

I got a vw jetta 2000 with 357000 km, and and I just got it a few months ago. I put so mmo in every time i go fill up the tank, it works, the Idle is smooth, no more miss fire and with the new fuel filter it even better.

[Scoottoots]

Any oil will improve compression on a test if the rings are leaky. The real 'Marvel' would be if it holds the compression after running substantially to burn that oil off. Would have been nice to see a final compression test after running.

[glennspeeds]

Looks like a newer style bike. MMO is great stuff for sure. Works great in the gas tank to help keep fuel injectors clean too.

[edwardmalfroid]

Near the end, do I hear a single cylinder backfiring?
Great video, I've been using MMO for years, works like a charm!

[normanhuckle]

Thanks Shane, MMO says that you can add it to you're engine oil! Would you? when would you and how much? Cheers.

[Greywolf-mvhx]

Nice job. Those engines are bullet proof but sometimes the rings stick.

[MegaCountach]

What was the compression after some time on the running engine? A follow up is in need for sure, otherwise your just guessing. Cheers, Doug

[horseman]

Nothing is better it's the best on the market 2nd to none

[bentagliarini]

I love using this stuff.

I've actually pored 20ml into each carb suction hose under tank, then refitted so conduct engine carbon clean on 1st fazer1000, now got 2nd fazer1000 and need do same but also like idea doing this, is it easy to get out with syringe once in cylinders? As dont want fail plugs, did that before putting whole bottle into tank lol, lazy, 4oz works well in tank.


My zx9r it worked wonders on poring into carb suction hose, then iridium new plugs, bike wasnt running on all cylinders then was and was brilliant

[krod]

The cylinders are candid you have to set the bike up so the cylinders are straight up and down for all the oil to sit on all the Rings and it loosen them when you put oil in a cylinder it brings a compression up right off the bat that tells you you have bad rings so run by for a while and compression will probably drop back down maybe unless you loosen the Rings

[soulgivesoul]

I was thinking of putting this in my motorcycle oil about 100 miles before my oil change, is MMO bad for my wet clutch?

[gavinberridge]

Did you pour the mmo into the spark plug hole im newer to the mechanic world and I have a Honda 4 wheeler with low compression and I’m just wondering where to put it

[jeffnations]

What about high compression on a NOS 2 stroke? Can't pull the pull cord? Suggestions.