Carlos -
I don't recommend the tranny fluid, either. I've done it, but I don't recommend it to other people. MMO works fine, and is even cheap, at ~$15 for a gallon, which should last for the life of your car, honestly.
Trans fluid acts like a solvent, which will remove coke and oil deposits from your engine. If you want to clean the engine, bite the proverbial bullet and run some diesel engine oil in it. There are detergents specifically formulated in that type of oil to remove coke and combustion contaminants, and it won't hurt your engine at all. It's still a lubricant, it's just a "specialized" lube, which has a specific formulation of solvents added to it that is designed to keep ash and coke from building up. Remember, diesel engines burn oil on purpose - gas engines do it as a design flaw.
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