My question, what OCI pertaining to miles are use BITOGers going when using a fuel system cleaner & they recommend using there product every 3000 miles? Chevron Techron Fuel System Cleaner or Regane High Mileage for example. If your religious about using these products EVERY 3000 miles and what I read/understand that these fuel system cleaners really do no nothing positive but more negative to the oil in the sump -- what are our OCI using fuel system cleaners. I personally, using these cleaners at 3000 mile intervals change my oil at 5000 mile intervals and the oil always -- no matter what car in signature smells like gas to some degree. Now, if you dont use these fuel system cleaners of course the question is irrelevant to start with. Just trying to get some feedback from this knowledgeable crowd!!