Every 16,000 km or 12 months.
1. Checking the tightness of the wheel nuts is appropriate not only for safety reasons (the need for reliable tightening of the nuts is obvious). Overtightening the nuts is also harmful: if you get a puncture on the road, and you only have a standard wrench in the trunk, you simply will not be able to remove the wheel.
2. Apply the parking brake, chock the wheels and engage 1st gear.
3. Remove the wheel caps using the flat end of the wheel wrench included in the tool kit (on certain models, you may need to remove the mounting bolts with a special wrench).
4. Loosen the first wheel nut using the wheel wrench from the standard tool kit. If this does not work, unscrew it with a socket head with an extension.
Warning: Do not use homemade devices to loosen nuts. If excessive force is required to loosen, check whether the tool is installed correctly and whether its quality is questionable. Keep in mind that the tool may slip or break off - take precautions, at least put on work gloves. Do not jump on the end of the lever to use your weight to loosen the nut - the tool is not designed for this. If you are unable to loosen the nut, seek help from a specialist.
5. After loosening the nut, unscrew it and make sure that the threads under the nut are not rusted or clogged. If necessary, remove dirt and rust from the threads with a wire brush
6. Replace the nut with the tapered side facing the wheel. Tighten it with a wheel wrench - nothing else. Then you can loosen the nut on the road if you get a flat tire. If you have a torque wrench, tighten the nut to the specified torque.
7. Repeat these steps with the remaining three nuts, then reinstall the cap.
8. Check the other wheels of the car in the same way.