Hi all

I have an old truck and have just bought some STP engine cleaning products that you add to the fuel.

- injector cleaner
- dpf filter cleaner
- general fuel system cleaner

Question, can I add all three at once to the tank or should I do them one at a time to different tankfuls?

TIA

think i would do them one at a time general/injector then dpf followoed by a complete filter oil change

Thanks