So in about 1.5 months when I hit 5000km I am going to change out most of the fluids to Royal Purple... I can only think of 6 major fluids to change..am I missing anything?

Oil
Transmission fluid
Rear Diff Fluid

I heard the above Three are the good ones to change and the below three really wont make a difference...am I wrong?

Power Steering Fluid -- Is there any point?
Brake Fluid -- Is there any point
Radiator --- Not sure I am going to do this...its expensive and wont really add any performance...


How hard is it to flush the rear diff? is it worth it to get a shop to do it?

Are there any other major fluids to change that will benifit the car?