just changed my oil and used Mobil 1 10w/30 and got to thinking about all the additives for oil and fuel that are out there and was wondering if you guys used any of them. on the VFAQ pages under the engine oil bible part it says only two companies have any real backup to what they sell. i was wanting to put some kind of additive in my next oil change but didn't know if i really should or even if it would really help anything. what do you guys think?

1997 Mitsubishi Eclipse GSX: K&N Filter, John Sheppard built transmission with GVR4 1st gear, autometer boost gauge, "free mods", Greddy type-s BOV, broken shifter