Has anyone ever used any of these so called miracle cures? My Jimmy runs fine but at 210k I am considering using the fuel system cleaner-even though I use MMO at every tank full. I have seen first hand the "coked" injectors in a previous motor I had when I did the LIM job and wish to pospone any normal failures at this mileage.I am always wary of any super detergent in the fuel system,espescially with E-10! I would do this right prior to an oil change and change the fuel filter as well immediately after. Opinions? Thanks!

 

I hate them.

 

The only thing I have ever used and would recommend is sea foam or B12