If no maintenance records came with your bike, I would definitely change ALL FLUIDS. 2013 fluids possible? Don't take the chance. The oil, well you can look on the dip stick for color, feel for grit, and smell for burn. If it looks okay, that may pass as ok temporary. But I would for sure bleed the brakes and clutch and get fresh blood in there. Coolant too! These jobs are not hard, maybe time consuming, but not hard. As for premium gas, I guess that is a personal choice. The manual does not require it, so you be the judge. I switch from premium to regular about every other tank, and I ride the 6 hard, and I see no difference in performance. 78,000 miles on my horse, and she runs great! Glad you joined the F6B group! Fantastic bikes!