I'm just hitting 30k on my car's odo...I just changed the oil (was using mobil 1, now royal purple, and honestly even though the name says royal purple, i was somewhat suprised to find out the oil itself is actually purple, lol.) and the coolant. i'm going to take it down and get a new fuel filter, is it time to get the power steering/brake fluid/atf changed as well? how hard are these to do? is it worth it to take it to a shop somewhere?