When I do these jobs on my '16 RT, I have all the goodies on hand to do as much maint. as possible at the same time, air, oil, filters, etc....And, since I have the plastics off, I spray things down well with some Simple Green and wash the crud out while I'm in there. Good peace of mind and satisfaction. When you know what you're getting into and what to expect, it makes it far less stressful and satisfying. When I changed the oil on a buddy's 17 RT, I noticed he had one less panel, and my wife's 19 RT was the same way. I believe they call it an acoustic panel (between the outer shell and the motor that needs to come off to access oil filter)