Welcome ...fuel additives I use power service because you can get it anywhere, it's not the best out there but works. Standyne is great also. Stay away from the cheaper stuff. Oil I run Mobil delvac, I'm an anal bastard and change every 3-4k. Overkill but I don't care. Always use a quality filter, Mobil 1 or acdelco. Fram is junk. Fuel filter I change every other oil change. Make sure your spin on filter on trans is new as well.!