A vehicle's chassis supports the weight of the vehicle and components like suspension systems and steering arms. In order to keep the chassis in top working order, it should be lubricated every three months or 10,000 miles. A good rule of thumb is to lubricate it during every other oil change. To lubricate the chassis, the vehicle's grease fittings need to be located. These will be in different places depending on the make and model of the vehicle, but typically are found near joints and connections. The location of all of the grease fittings can be found in the vehicle's owner's manual. Many modern vehicles are being made without grease fittings, but instead have Teflon coatings on the joints that don't need maintenance. If this is the case, the chassis will never need lubrication.
Park the vehicle on a flat, level surface and set the parking brake.
Place the jack under the center of the frame in the front of the vehicle and lift it up. Place jack stands under the axles. Remove the jack and place it under the center of the frame in the rear of the vehicle. Jack up the vehicle and place jack stands under the axles.
Go to the first fitting and wipe it clean with a rag. Make sure to clear any obstructions from the small hole in the fitting so that grease will be able to enter the fitting.
Place the end of the grease gun's hose on the fitting and push it forward as far as possible. Squeeze the handle on the grease gun until the boot around the fitting inflates slightly. Do not add too much grease to the fitting. If grease leaks out from anywhere around the boot, stop immediately before damage is done.
Repeat with all of the other fittings on the vehicle. Place the jack under the back end, remove the jack stands and lower the vehicle. Place the jack under the front end, remove the jack stands and lower the vehicle.
