What petrol additives does anyone recommend for use in a 348?
They really shouldn't be necessary on a regular basis. I know folks who will occasionally use Chevron Techron, or one of the Lubro Moly additives (they make several).
Even my mechanic recommends some sort of injection cleaner - Techron for example. As an octane booster, you might want to try a little 100 unleaded to try and up your average tank octane a bit. It does seems to pick up the motor, kind of like when you drink a Red Bull. Anything over 95 octane average probably isn't going to do anything on a stock engine.
