The ability of the Volkswagen ball joints to be the pivot point of the front wheels is how your vehicle is capable of turning. On all Volkswagens there is a pair of lower, and on some a pair of upper, ball joints on the front wheel assemblies. Each side has one of each in which the spindles are mounted. To help keep the Volkswagen ball joints operating as they were designed to, they must receive a regular injection of ball bearing grease into them. The most common time for this to occur in the periodical maintenance schedule of your vehicle is when the oil is being changed and the technician performs a body lubrication on your vehicle. While the rest of the steering components can be greased when the weight of the Volkswagen is on the wheels, it is critical that the wheels be suspended in the air when the ball joints are greased. If the weight is on the wheels, there will be pressure from the spindles on the joints preventing the lubrication from covering the entire ball joint. This will lead to premature aging and wearing on this steering component and will cause them to fail before their time. It should never be assumed that the greasing of the zerks on your vehicle is being done correctly. Many of the economy oil change facilities have roll on ramps. This type of system, which does gives access to the under section of the vehicle to a technician, does not provide for a means of suspending the wheels and permit the proper lubricating of this steering components. If the technician or service representative informs you that it is ok for the ball joints on your Volkswagen to be lubricated in this fashion, they are just milking you for your business and not truly taking care of your car.