That will depend on how the vehicle is used and what the manufacture recommends.
It could be as soon as every 20,000 miles or as long as 100,000+
Be more specific, Are you talking about the transfer case, transmission, or front differential?
once a week is recommended
You should get your floor machines serviced once every other year. They require regular upkeep in order to last a very long time.
Annually. If it`s fueled with oil absolutely annually.
Your fuel tanks are built to last the lifetime of your vehicle. They should only need to be serviced if they are damaged in an accident, or if some contaminant has been added to the tank.
The differential, often referred to as the "rear", is the gear housing which transmits the rotation of the driveshaft to the rear wheels. A four-wheel drive truck also has a differential for the front wheels.
Every 50,000 miles.
30,000
Every 30,000 miles
once a year, or 15,000km whichever comes first.
HVAC should be serviced about twice a year. I prefer service just before summer so I'm not left in the heat and just before winter so I'm not left in the cold.
The front differential fill plug on a Kia Sportage is typically located on the differential housing itself, usually on the driver's side. To access it, you may need to lift the vehicle for better visibility. It's often a hex or square plug, and you can identify it by looking for a threaded opening on the differential case. Always refer to your owner's manual for specific details related to your model year.