[Johnny Mullet]

I use no additives at all. I don't believe in them to tell you the truth. I truly believe fuel system cleaners or injector cleaner added to fuel does nothing but shorten the fuel pump life. Gasoline itself is not only a flammable liquid, but it also cleans.

If you have to add additives to your oil, then you must be using the wrong oil. I simply change my oil every 5000 miles and use the lightest recommended grade of non-synthetic oil.

It all comes down to what the manufacturer recommends and there is an interesting book in the glovebox called an "Owners Manual" that everyone should read. If you don't have one, get one! That manual says nothing about adding poop.

Now there are 2 small things....................

SeaFoam - Great for cleaning a gunked up engine, but not as an additive.
Marvel Mystery Oil - I dunno because it's so mysterious.