I'd be careful about putting any oil additive into the gas; Mystery Oil included. The purpose of the cat is to burn off any small particulates so it doesn't come out your exhaust pipe as unburned fuel or other byproduct.

Cleaning the carbon off piston tops is an unneeded exercise in futility. The only thing that will happen is a very slight increase in compression ratio will develop over time. Better to just use a PEA fuel system cleaner that dissolves crude in the passages and injectors.

The other reason to not try to break apart the carbon build-up is it will go out the exhaust right to the cats and clog those small holes and since it's carbon from the cylinder it will probably not burn up and pass through the cats.

My guess is the guy from Iran is used to a different kind of exhaust system in Iran. They might not even have cats required there. Almost certain they don't have smog tests every year or two. On a non-cat vehicle running some mineral spirits through the system wouldn't hurt anything but it probably wouldn't help anything too.

I had an older neighbor years ago who used to say that using a tank full of premium gas was better than using an occasional bottle of fuel system cleaner. The exact opposite is actually true. Also if you buy from a name brand station like Chevron/Texaco/Mobile/Shell; you never need to add any fuel system cleaner. They have that stuff added to their gas which is partly why it's so much more expensive than the JollyMart station like I normally use. And yes; I do add a bottle of quality fuel system cleaner once in a while. Especially if I notice my car is turning over longer before starting.

As far as cleaning the engine; just change the PCV valve and air filter regularly and use a synthetic oil. If the engine is kinda dirty from a PO not changing the PCV valve; just do more frequent oil changes for a while like at 3k instead of 5k. Do that 3 times and you have the engine about as clean as you can possibly get it. If you want to give it a jump start on getting clean; add a can of BG EPR before you change the oil and run for 15 minutes. Better yet; get these three products to do all the things that Iranian guy said would clean up your engine and make it run better. They are kinda like a tune up in 3 cans. If you notice a significant difference; redo it every year or two.

Sorry. Got stuck on purpose of cat. While it Could also be for what your referring to it's chemical purpose is to Convert nitrous oxides into carbon dioxides, which are "safer" for humans (except for that warming of the planet idea). Hence the name catalytic converter. Will it attempt to burn things passing thru it, sure.

Luck and enjoy those Runners.

Marvel Mystery Oil works good at cleaning up stuck gunk. When grabbing a motor for a swap and they've been sitting for a while sometimes they will have valve tap knocking n stuff. Getting some Marvel Mystery Oil in the intake, fuel tank, and crankcase will take care of it and loosen things up. Scrap yards will tell you this if you call and complain a motor you bought from them is tapping.

BG products are great. I always have a few cans of 109 on hand.


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Acetone is good. I use it regularly - always, in fact. But you don't seem to know how to use it. Start with 3 fl. oz. per 10 gallons of fuel. Keeping a running score, adjust the mixture until the fuel mileage peaks. Do this slowly, as "fill her up" mileage is not all that accurate and averaging is necessary.

There are other things that, in SMALL AMOUNTS, can improve mileage and combustion. Naphthalene is one. Use 100% naphthalene moth flakes. (You need to crush moth balls and that gets boring 3 heaping teaspoons per 50 gallons of fuel. Nice if you mix the acetone and naphthalene first.

BE CAREFUL! And don't get busted for bomb making or a meth lab. Seriously. Buying that stuff can get you searched, at the very least.

You can probably get away with using MMO on these old engines but I'd avoid it on anything made in the last 10 years. YMMV, FWIW, JMHO. It's a good product IMHO. I have a bottle of it in my garage too.

What kind and quantities of mixtures are you using in your gas tank?
Are you getting any significant MPG or performance boost?
Are you using non-ethanol gas?

Saw this website, kind of fascinating but hard to believe.
"Hydrogen Electrolysis Free Information Web Site dedicated to those who want to do something about the wasted fuel their engines do not burn"

And drill down to this link:
Free Energy Now: Acetone in Fuels - Double Your Mileage

I played the acetone for Fuel milage game in the mid 90’s with my 93 ZX7, Dodge Daytona, and my 94 Ram with the Cummins. I now use it for a constant fuel system cleaner, it’s 150 octane, and its ability to absorb water( to counteract ethanol). I just put 2 2oz syringes in at each fill up. On my Saturn I do notice my LTFT is two more negative than what I normally run. But my mpg was not noticeably better. Too many variables to ever be able to associate it with an increase in mpg.

Ive used every flammable solvent in my lawnmower....MEK was my favorite.


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