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Marvell mystery oil

3.3K views 17 replies 17 participants last post by  Filthy_McNasty  
#1 ·
How many people use this product in thier bov's and daily drivers and what are your thoughts on it?, i just started using it in my truck to see if it would help after years of not using it and my gas consuption has dropped and the truck seems to have more horse power too, going to use it for awhile just to see if it contiues to work and not just some snake oil, but the results look promising.
 
#4 ·
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
 
#10 ·
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
 
#12 ·
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.
 
#14 ·
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