Ok, so here lately ive been getting the P0308 code when I leave my truck idling for awhile. I know that injector #8 is requiring more fuel than the others, and I think the pin in the injector isnt sliding in and out correctly. I figured adding some kind of lubricant would help the injector. I use the Power Service Diesel Kleen (Gray Bottle) every other day, and everytime I fill up. So whats a good lubricate to help me for awhile?