I'm just about to turn 50K miles on the odometer and want to go through car. I'm going to change the fluids in the front/rear differentials and PTU, change the struts/shocks and change the spark plugs. The transmission was already done so that's good and oil is done every 5K. I'm planning to use OEM fluids, PIU struts/shocks and NGK plugs. Is there anything else I should do?