control arms make it so your wheels stay connected to your strut and frame of your car. if your hearing a clunking noise when going over bumps, this may be your problem
if the vehicle pulls to the left or right without you guiding it, you may need an alignment. this will straighten out your ride, and make sure you have proper tire ware
oil changes should be done routinely every 5000 miles, or every 6 months (whichever comes first) this is the price of the oil change if filter and oil are provided by the customer.
cabin air filter is essential to help you breath clean air when you turn on your heat and A/C! it filters out all the dust and debris from the road so it doesn't get in your car!