Hello everyone.
I have never used Marcel Mystery oil before.
I have seen it mentioned alot, throughout the years.
Is this product snake oil or is it magical?
Any thoughts on why it might or might not be good?
Thanks all!
Mike, I’ve never used it myself - but like you, I’ve read posts where people swear by it. Here’s an article that promotes it.
Dan
…and if Dick Koch recommends it, you know it’s good! 
I have never used it either. Is it like the old STP treatment? I never heard bad things, some have used it in tractors. Mark
Marvel Mystery oil is similar to basic automatic transmission fluid, as it’s a light oil.
Being that it’s light, it is good for breaking stuck engines loose, as the fluid seeps into small areas more easily than thicker oils.
—John
I have used marvel oil for decades, with good results. free up stuck engines, engine flush, air tool lube and oxidization remover.
Rick
It is amazing product.
Marvel does what it says it does, it’s a detergent that works fantastic in gas and oil and lovers oil viscosity.