How to Change the Engine Oil on a Jeep Wrangler JK DIY

To safely change the oil in your Jeep Wrangler, work with the engine warm (not hot), on a flat surface, with the vehicle stabilised and supported on approved axle stands. Open the bonnet and prepare access to the oil filler cap so that the oil in the sump drains more easily during the discharge.

Position a large container under the sump area and locate the drain plug. If there is a shield or panel under the engine, remove only what is necessary to access the plug and filter.

Carefully loosen and unscrew the drain plug, allowing the used oil to drain completely. If the plug has a washer/gasket, replace it and clean the seating before reassembly.

Next, move on to the oil filter. Depending on the engine fitted to the Jeep Wrangler JK, the filter may be a screw-on element or a cartridge in a filter housing: locate the component and protect the area with rags as residual oil may escape.

Unscrew the filter (or the cover of the filter housing), remove the old gasket where applicable, and clean the mating surface. Before installing the replacement, moisten the new gasket with a thin layer of clean oil, then fit the new filter and tighten it correctly (without over-tightening; for the exact value, always refer to the workshop/user manual).

Refit the drain plug and check that everything is clean and dry under the engine. At this point, add new oil through the filler neck, adhering to the specifications and quantities required for your engine (viscosity and litres depend on the engine type).

Start the engine for a few seconds, turn it off, and check for any leaks around the plug and filter. Wait a few minutes, recheck the level with the dipstick, and top up to the correct level.