Hello, It's been awhile, but I'm just about to pull the trigger on a very nice 08 Base, automatic with 43k miles. Although I'm not a mechanic, I still like to do preventive maintenance on my cars, like changing all fluids, belts, and plugs.....do these cars have plugs? Is the transmission sealed? etc. What can I use on the top to preserve it? Any other ideas are welcome...Thanks!