Yes you can change all the oils with the kit on, I think even with my body on I can do it. Changing a rear tire, you would have to remove the back section which takes a about 20 min, takes a bit longer to put back on. On my body would take all day to change tire, as the body hase to come off, 8 bolts, wires, etc. I find it is smoother than the bike, but I have Icon shocks and springs and Progressive air shocks on trike, so each thing helps. GW trikes are rougher with Trike kit on from what I read. Wayne