I haven't reached 15K miles on my '01. I have a beater and I live 1 mile from work plus the wife is pregnant and doesn't fit too well in the S right now. I have 3 cars and they all sit at home while I walk to work.

 

I did the complete fluid change at 5k engine,trans .clutch,and diff.I notice a better feel in clutch engagement and quieter tranny and rear diff "sounds" in the morning.I just completed a 10k engine oil change last weekend and will do a 15k complete fluid change and have the valves adjusted at the same time!