Comments about Marvel Mystery Oil Marvel Mystery Oil:

I "bless" every engine i come across with this product. Part of a little voodoo ritual i do for anything that burns fuel. Legends of it poored into carburators to unstick valves, resurecting 70 year old engines, relieving pings and knocks go back in my family for generations. Add to oil and fuel. Makes anything run better and longer. I also use it to lubricate riffles, works great there too. Pleasing aroma aswell! Onlything it wont fix is a head gasket, but if they had been using it before....... Also makes a great all purpose household oil, and for all manner of unaproved emergency uses also ( i wont list them, but, if you have no other fluid on the side of the road, chances are its better than dry ). Dont leave home without it!

Comments about Marvel Mystery Oil Marvel Mystery Oil:

I have been using MMO for over 50 years. I first discovered it when I saw a lawnmower rebuild mechanic filling a newly rebuilt lawnmower gas tank and adding MMO. He said if I were to use MMO religiously I would not need to use his service. How absolutely right he was. Compression is maintained, cools engines,improves starting, winterizes and keeps motors running as new. Best stuff I have ever used. Thanks MMO for the many hours of maintenance free and worry free performance you have given me. This product has not let me down once.

Comments about Marvel Mystery Oil Marvel Mystery Oil:

I have a 1995 Harley Eletra Glide with 76,900 miles it started using oil So put a 1/2 of a bottle. When I changed the Oil Put on 300 miles it did'nt use no oil I will keep a close eye on it Bike seems to run better!!!

Comments about Marvel Mystery Oil Marvel Mystery Oil:

My inboard boat engine (1988) has been stalling and losing power since the local gas switched to E10 (last 2-yrs). My mechanic suggested the ethanol was cleaning out the engine, plugging up the fuel filter and maybe carb, not to mention corroding the rubber. I tried tuneups, Techron and other magic exilirs but resisted MMO because it seemed archaic and obsolete. Again, I was at the autoparts store to try a few more and the pimply faced kid at the counter suggeted MMO because his Dad always used it. Eh, what the heck? The first try in the gas and it was purring like a kitten. Now I'm finding how popular this stuff is with people using carburated engines, including the military.

Comments about Marvel Mystery Oil Marvel Mystery Oil:

i hardly don't trust many products to use on my truck but my brother kept insisting that mystery oil really works he's been using it for years he just brought a used truck and was having problems he ask me to go over and help him find the problem well it wouldn't start it turn on then off he then told me he had the solution he brought this mystery oil and whoa la it turned on like a brand new truck he put some in his oil and on his fuel it was also making a cranking sound but no more. I was sold on this product IT'S WORKS!

Comments about Marvel Mystery Oil Marvel Mystery Oil:

My wife 1998 Nissan Pathfinder was losing power. It would hesitate and die at acceleration. I decided to add 4 oz of Marvel Mystery Oil and voila after a while the engine started to regaine power. Now I am planning to use MMO more often. Is an affordable product if you compare it to other leading brands. Amazing Stuff!

Comments about Marvel Mystery Oil Marvel Mystery Oil:

It is good for all engines and for body and soul...it is a great product ! It keeps your GI track regular and cleans you out !

Comments about Marvel Mystery Oil Marvel Mystery Oil:

As a little girl, I remember my father using this stuff. I put over 100 fast miles on my engine every day...Sure, it will need work one day. But until that time...I'll keep on using MMO! Best stuff ever!

Comments about Marvel Mystery Oil Marvel Mystery Oil:

I grew up around airports, aviators and airplane mechanics. I'm an old codger (58) who still flies.

In the mid 1960s, my dad did the "take your son to work" thing and I spent many enjoyable days in a very large hangar in El Paso where it was common to watch A&P mechanics overhauling engines. Marvel Mystery Oil was used in all the airplanes here. My father flew a Beechcraft Twin Bonanza Excalibur in those days (400 horsepower in each engine) and they used MMO in the crankcase at each oild change.

The seasoned mechanics AND the pilots swore by MMO, and many of these guys were Army Air Corp pilots during WW2, having lots of experience in lot's of different airplanes.

I took my first lessons in the Excalibur (when I was 12, no kidding) and got my license early. I'm 58 now and on my 12th airplane, have used MMO in the crankcase and fuel, 4 ounces per 20 gallons. No problems, no sticking valves and on a tear-down of one my Lycoming 0-320E2A engines, (my dad was also an A&P) my engine was sparkling clean, the wear was astonishing low (in fact the camshaft and crankshaft were the same limits as when new!.)

I bought a Cherokee 140, brought it home, pulled the "freeze plug" on the crankshaft (behind the prop) this was the hollow core crank, and GOD was it loaded with lead deposits. We sucked the goo out as best we could, put a new plug in. I continued to fly the Cherokee and two years later pulled the plug, and the crank was SUPER CLEAN. I ran MMO in the gas and the oil for that 2 year period, and I'm 99% certain the MMO helped clean the lead out of my engine.

My friends who flew (in the same general area I live in) who didn't run MMO, had lead problems, plug fouling and one guy had sticky valves... I've never had a problem and I am a believer in MMO.

Nope, it isn't FAA approved (to do so costs major bucks) and the company who makes this stuf probably is happy to have customers who run tractors, stock cars, boats buying MMO... Even if the went through the expensive FAA certification process, would their sales increase? Maybe a tad, but not enough to justify the cost of going through the hoops and hurdles with the FAA process.

One sidebar note... I use MMO in a couple of tractors on my farm. When the sit during the winter and are not run, I believe the MMO is at work. I also draw a vacuum on the oil tanks and crankcase, purging the engine of moist air and I replenish with nitrogen (the same stuff I use in my struts on my airplanes in place of compressed air containing moisture...) I learned this "trick" from the old mechanics I knew when I was a kid growing up in the hangars.

Comments about Marvel Mystery Oil Marvel Mystery Oil:

We discovered this product one day. The bottle lasted two years and it was the most fantastic lubricant we have ever used. Now we have been unable to find it no matter how many stores we shopped in. Can anyone tell where to find it?

Comments about Marvel Mystery Oil Marvel Mystery Oil:

I was a little kid in 1960 and my Uncle Gib used it in his tractor we saw how clean the engine was. He had the side cover off to inspect it. My Dad could not believe how clean it was. All Uncle Gib said was that is what MARVEL MYSTERY OIL will do. Today I still use it and have always been happy. I also use in in my gasoline. Things for gas and oil come and go,but I will still stay with MARVEL MYSTERY OIL. Why use something else when you have the best!!!
Thank you so very much,
Hal W.

Comments about Marvel Mystery Oil Marvel Mystery Oil:

I drive Nitro Methane Radio Controlled cars and mosnter trucks. I use this as a build oil when assembling, and as an after run oil when I am finished driving them for the day. I have never had an engine issue. I run the absolute snot out of my engines and they always run great. When I tear down for a cleaning, they are always nice and clean absolutely great. When I store my engines for the winter I load them up with Marvel and put them on the shelves, come spring time and I fire them up, they smoke a bit (burning out the MMO) and then they run great. I have had friends wear out motors and I run mine 100% harder than them. Only difference in engine care is I run MMO they use WD-40 or "after run oil" from the hobby shops at 5.00 a little bottle....my 1 qt of Marvel will last me all year. I also put it in the fuel of all of my yard equipment. My snowblower is a 31 year old Ariens, Tractor is a 26 year old Simplicity....

Comments about Marvel Mystery Oil Marvel Mystery Oil:

My uncle raced nitro-burning Harleys for 20 years and recommends MMO, so I started using it when I was a teenager. Today's oils are very good and if you change it ON TIME I doubt there's much benefit to using MMO in the crankcase, but in the fuel it's another story. I've been driving since 1978 and I have never had a fuel related issue. I bought a 14-year-old bike last year that ran well but would starve for fuel at high speed. It has a vacuum operated fuel valve (for safety) that is known to not open all the way, causing this problem. Several months later with MMO in the fuel, the problem is gone. Chew on that, MMO skeptics! I'm not sure when it went away as I don't ride fast all the time, but now that it's spring again I wrung it out and the problem is GONE. I know that most additives are snake oil. They won't cure a worn-out engine, and they won't increase your mileage measurably, if at all, and I don't hope for miracles in a bottle, but MMO is a superior lubricant that penetrates and dissolves deposits, period. It's the oldest additive on the market and the FTC has never gone after them. Probably because it works!

Comments about Marvel Mystery Oil Marvel Mystery Oil:

I've been using this "snake oil" for twenty five years on my own vehicles upon the recommendation of a mechanic and I have never had any engine or fuel system problem, ever. I use one part Marvel to four parts of the cheapest 20/50 SAE motor oil and the best oil filter I could find for the crankcase system. I cut it with 20/50 since I get more viscosity than with 10/40. For 5/30 engines you should probably try cutting with 10/40. Marvel will definitely lower the viscosity of whatever oil you use.

For fuel systems, I periodically mix about 8 to 12 ounces into a twenty gallon tank of gasoline depending on how low the gauge is.

I ran a 1984 Dodge Van with a 318 V8 with a carburetor 125,000 miles until I wrecked it, 17 - 21 miles per gallon around town and on the highway.

I ran a 1993 Saturn 300,000 miles until I just got sick of driving it, 27 - 32 miles per gallon city and highway. At the end it burned 8 ounces of motor oil per 350 miles. However, I beat this hog and I routinely drove it at 80 miles per hour and often more up and down the mountains in New England.

I currently run a 2003 Dodge AWD Sport minivan with a fuel injected 3.8 liter V6. I've run it 50,000 miles so far at 20 - 22 miles per gallon up and down those same New England mountains. It has 120,000 on it now.

Marvel is not cheap at 15 or 20 bucks a gallon. However, when used regularly, according to the instructions on the label, in the crankcase and mixed with gasoline, it cleans all the junk out of the crankcase oil system and your fuel system over time. If your engine is in good shape and you change your oil, plugs and wiresets when you are supposed too, then do be surprised by a noticeable improvement in mileage and smoother operation almost immediately after starting use of it. I believe it is worth the price in that it has eliminated major repairs in my case.

If you hear knocking and pinging at cold start do not be surprised when it disappears after using Marvel. If your engine is too loose then its too late. Nothing will improve an engine that's beyond proper mechanical tolerance except a rebuild.

This stuff is no joke. Before the mechanic recommended it to me I was in the military and I worked on a lot of rusty crusty vehicles from the tropics to the arctic. We invariably had a crate of nondescript nameless olive drab colored cans of penetrating oil, type one each, with a national stock number for military supply. The first time I cracked open a can of Marvel bought from a civilian auto parts store, I immediately recognized the scent. Its the same stuff. The military has been using it for seventy years or more.

Its the only additive that I ever use. I've been told that the secret is in the fact that its a very light weight penetrating oil along with a boron additive that dissolves varnish and sludge. That's why you must use the best crankcase oil filter that you can find. You want to trap all the junk in the filter so that it does not circulate back through the crankcase systems. The boron additive apparently polishes engine surfaces thus contributing to smoother operation.

Marvel is also very good on anything that's rusted. It eats rust. I know some guys that even poured it into completely seized, rusted motor blocks that sat for years, decades even, let it soak through and then broke the seize with a starter and ran the things as well! Not for the meek, though.

Whatever, I don't work for them or own stock in them, I just know it works. Remember, when all else fails, follow instructions.

Good Luck & Godspeed.

Comments about Marvel Mystery Oil Marvel Mystery Oil:

My grandfather,uncles&dad,used marvel on the farm.Dad used it on the army tanks & when he was working for diesel shops.Tranmissions also received treatments.My own experience,came from my 50 chev.& 66 Honda M/C.The teardown revealed,a clean engine,polished journels,&more pleasant smell to the engine. Thanks DRA

Comments about Marvel Mystery Oil Marvel Mystery Oil:

I can only say that I have a 1990 Saab Turbo with 206,000 miles. I drive it every day. I use MMO often, and for the last 3 years. The engine works better with it. I don't know why. My mechanic swears by it. For him, it's like WD-40. He uses it on his food, as massage oil on his wife, that kind of thing. I'm not there yet, but I've come to believe in it. And trust in it.

Comments about Marvel Mystery Oil Marvel Mystery Oil:

I have used MMO for years to reseat rings in engines that have been sitting unused for long periods of time. Recently I used MMO in my 1997 Lincoln Mark VIII and discovered an added benefit. The check engine had been on for 6 months with a diagnosis of a stuck fuel injector. I tried many other products to free the injector without success. After 1 1/2 tanks of gasoline with MMO added, the injector released and the check engine light is out! Inadvertently, I saved myself hours of aggrevation and hundreds of $$$. Best [$] I ever spent!! Give it a try.

Comments about Marvel Mystery Oil Marvel Mystery Oil:

I've used Marvel Myatery Oil for the last 40 years in all, or almost all gasoline, powered autos, aircraft and other things that I've owned. The engines show less wear, run smoother, quieter and have fewer maintance problems than engines run w/o MMO. Every auto I trade-in is usally snapped up by one of the mechanics who work for the dealer I buy from. I will use MMO in everything I use as MMO has proved itself to me time and again to save engine wear and tear, prevent carbon build-up and enhance gasoline mileage.

Comments about Marvel Mystery Oil Marvel Mystery Oil:

For the first time I am about to try Marvel Mystery Oil...Used to be a Certified Technician worked for Ford Back in the day...I think I may have added too much, I put 8 ounces to 11 gallons of fuel,lol....To clean out engine carbon I mixed 1 part distilled water and 1 part Mystery, applied to intake at 1500 rpm through spray bottle into intake...Lowered RPM to idle then finished off the bottle til engine systematicaly stumbled...Let soak in for 25 minutes...Took Crown vic out for a hot supper...Noticed some increased power,suspect there is some acetone in this along with light lubricant, seams to work well softening carbon buildup on valves....I am very reluctant to use it as an engine flush though, definetely would not leave it in the oil...Next I will try putting it on a cheeseburger....

Comments about Marvel Mystery Oil Marvel Mystery Oil:

I have been a mechanic for many BMW dealerships and AUDI dealerships. I now own my own shop in Maryland and have used Marvel Mystery Oil for many years. I run it in my 06 Hennessey Viper. That is how much i tust it. I even use it when rebuilding enginges, as a assembly oil. The stuff works bottomline use it in everyting even small engines like lawnmowers.

Comments about Marvel Mystery Oil Marvel Mystery Oil:

I started to have engine knock (tap-tap-tap) on startup when the engine was cold. A friend of mine recommended Marvel years ago, but I never tried it. My mechanic said it sounded like I had a lifter sticking? Anyway I put a pint bottle in the oil and ran the truck 30 miles. Next morning the tap-tap-tap was gone! Have not heard it again. Awesome stuff. Thank you.

Comments about Marvel Mystery Oil Marvel Mystery Oil:

It probably doesn't hurt anything, but it certainly doesn't confer any benefits either. The stuff is just 5W oil. No mystery, and not that marvelous. Save your money and skip the too-good-to-be-true wonder products.

Comments about Marvel Mystery Oil Marvel Mystery Oil:

Heard of others using it in their aircraft. I had one exhaust valve stick twice before using MM Oil and not once since.

Comments about Marvel Mystery Oil Marvel Mystery Oil:

I've used this product for years...when I see how many pro's use it and heavy machine makers and repairers using it.. Caterpillar etc I was convinced this is a great additive..!