Paint sealent= really expensive car wax. Wax several times a year and you are all set. I probably would have the axle gear oil changed. After 10 or 15K on a new vehicle I go strictly to synthetic fluids. By that time all parts are wore in, and you want to get out all the metal bits that are mixed in the oil. As most vehicles made in America, dodge, jeep cheby, and ford no longer put in drain plugs for axles, you need to crack the cover. Thats where they get you, LABOR for taking off a bunch of bolts and resealing. I just run it til axles are warm, pop the fill plug [usually a rubber plug], use a 4 dollar suction pump you fit on an electric drill and voila! Emptied in about 1 minute. Clean the hose and reverse, pump in the new 80-90 synthetic. I will have the dealer do the tranny fluid every 30K as it is worth it to me to be able to pitch a bitch if it goes out prematurely. There are some jeep x-fers that take a special oil or additive, and some take just plain ATF [[dextron].[usually the ones that are not AWD] What you need to do is use the maint schedule BOOK that came with the vehicle, if it's not in the book, they are BSing you, and thats where the cash is.