I only put 9k miles a year on my 03. I change the oil every 3k with regular motorcraft oil. I have swapped out brake fluid once. Since the car is 5 yo, should I go ahead and change out some of the other fluids? It only sees highway miles and one track trip a year. Just as an example, I just got a new battery....I thought it was a 5 yr battery, didn't realize it was just 3 so I guess I got my money's worth from that.