yep arcticcatred keep using what your using, i have red/heard that you could use mobile one in the wetclutch setups like the 400/500/700's due to no friction motifiers but i would stick to what works and covered under warrenty.
as for the v2 there is no wet clutch setup in it (primary clutch constantly spins), so mobil one is what i run in my v2 with no problems, with 75w90 mobil one for the diffs. my main reason is that i run mobil one in all my equipment,cars so much easier to stop at the local walmart and i know what/how much i need. i run the cat oil change kit in the wifes but hers is a once a year change (alot less milage than i ride).
stock cat filters i have heard are wix filters but imo napa,cat,wix, or even k&n will all be just fine.
so showtimeauto if your cat dealer is close by i would just stick with there oil change kit for 20+/- dollars not too bad imo.