what service should be done @ 50,000 miles? tune ups? belt changes? on 2008 Infiniti G35

car semms to be lacking power and oil change

Asked by for the 2008 Infiniti G35
If you have about 50,000 miles just change the spark plugs and air filters and see what happens. If you are due for an oil change then do that too. Also, can't hurt to change the fuel filter at this time as well. Belts should be okay but, apply belt conditioner spray to them so they don't start drying out and cracking.
i agree except don't spray belts if they are serpentine type, you will cause problems