To change the motor oil of a KTM Adventure 890 R, start by placing the motorcycle on a flat surface, preferably using a center stand for stability. Warm up the engine for a few minutes to fluidify the oil, then turn it off. Under the engine, locate the drain plug and place a suitable container to collect the used oil. Using an appropriate wrench, unscrew the drain plug, being careful of the possible leakage of hot oil. Let all the old oil drain into the container. Once the oil has stopped flowing, clean the drain plug and replace the washer if necessary. Reinsert the drain plug and tighten it securely, but not excessively to avoid damaging the threads. Find the oil fill cap, usually located on the side of the engine. Remove it and use a clean funnel to pour in the new oil, following the quantity specified in the user manual. After adding the oil, screw in the fill cap. Start the engine and let it run for a few minutes, carefully checking for any leaks. Turn off the engine and let it rest for a few minutes, then check the oil level again to ensure it is correct. Dispose of the used oil following local regulations, taking it to a recycling center or an authorized workshop. This completes the oil change process for your KTM Adventure 890 R, ensuring optimal engine performance.