I've used Lucas, didn't notice any difference. I have used Seafoam which worked well, different application though.

 

its made from castor beans. which unsurpassed as a low temp lubricant . similar to whale oil. but it burns off with little residue which makes it a great upper cylinder lube when mixed with fuel.

 

I have been using it for 40 years in aircraft engines. Most of the older airplanes engines with carbs were designed for 80 octane (really 87) aviation fuel . That fuel was done away with and replaced with 100 octane aviation fuel, but with 4 times the lead of the 80 octane. So the old engines would have their valve guides bind up with lead and a stuck valve. If you use MMO in the fuel, you will have no problems with stuck valves using the hi-lead 100 octane fuel. But you will still have lead buildup in the sparkplugs. Just clean the sparkplugs about every 50 hrs and run the engine at least 75 % power.
I also use it in my auto and pickup truck. Pops

 

It is good stuff. My grandfather and father used it. I use it.

 

Make a great machine oil as well ,like air tools

 

I have used this for 20 years and love it. I find it extends the life of small engines, like lawnmowers.

 

I've used it occasionaly in gas for lubricity purposes to help slow down the destruction on the fuel pump in my vehicles caused by ethanol-laced fuels.

ATF or a little diesel fuel also works good too and is cheaper most of the time.

 

Yes. I use it as a motor flush, air tool lube, penitrating oil, gp lube. Seafoam is also some good stuff

 

I have used it for years, 1998 Jetta TDI Diesel 400,000 miles, 2005 Jetta TDIDiesel 83,000miles, 1995 Ford F250 diesel 330,000 miles. All original engines, Need I say more. When I first bought my Jetta imet a guy with a 1980's Mercedes Benz diesel wagon that looked show room new, he asked about the Jetta Diesel and gave me a bottle of MMoil and told me that he has used it in his car and told me his Benz had 525,000 miles, all original. I am sold on it.
Dave

 

At about 300 miles before my oil change and I poor in MMO into my oil and Techtron into my gas. Both are supposed to do some cleaning and knock carbon loose before the oil change.

 

Bearhawk, you are one of few people that I know of that is aware of the av-gas issue. When I left the military I worked at an FBO. I overhauled and tested aircraft engines. We had several Wright radials come in with top end damage due to valves sticking open. They were built in WW2. The valve guides needed high lead fuel to lubricate. The 105 (etc) octane, low lead, av-gas was killing these engines. Our solution was to use modern valve guides since lead in gas wasn't an option. Plus, as you may know, Wright engine parts are hard to come by, unlike Pratt and Whitney.

Anyway, back on topic, we used a lot of Marvell Mystery Oil on those old WW2 era aircraft engines, and everything else.

I don't use it, personally all that much. I do use Seafoam. That is good stuff.

 

I used to use it in my 88 waggy....but I'm not sure why. Can't remember it doing much of anything other than smelling minty.

 

Falconbrother- Yep, it's a big problem. MM oil sure helps. I have restored 7 old aircraft. My airline pilot grandson learned to fly in a Stearman when he was 15 years old. He spent 3 summers barnstorming the Stearman with my neighbor giving rides.
I have never used Seafoam, would it be better than MM oil? Pops

 

I have used it for 20+ years...it is all that.

 

I just started using it in my lawn equipment. Too soon to notice a difference.

 

Stuff is great in gas and crankcase. Seafoam is good too.

 

Works good for cleaning firearms as well..