How to Change the Oil in a 2018 KTM 300XC: Your Comprehensive Step-by-Step Guide

Shop parts for a 2018 KTM 300XC Dirt Bike.

Changing the oil is a vital maintenance procedure for the 2018 KTM 300XC. Keeping fresh oil in your gearbox ensures smoother shifting and extends the life of your engine parts. This model uses gear oil rather than traditional engine oil since it's a two-stroke–but the process is straightforward with the right tools and technique. Below, you'll find all the info you need to get the job done expertly.

Tools and Supplies Needed

  • 13mm socket or wrench (for drain bolt)
  • 8mm socket or wrench (for oil level bolt)
  • Torque wrench (capable of 10–20 Nm settings)
  • Oil catch pan
  • Funnel
  • Fresh gearbox oil (0.8 liters / 800ml, as recommended by KTM)
  • Replacement crush washer (for drain bolt)
  • Gloves and clean rags

Preparation

  • Warm up your bike slightly (a minute or two of idling) for better oil flow, but allow it to cool to avoid burns.
  • Place the bike upright on a stand for best drainage.
  • Remove your skid plate if necessary. Some riders tip the bike gently to the side for easier access to the drain bolt–especially if the skid plate is a hassle to remove.

Step-by-Step Oil Change Process

  1. Remove the Oil Fill Cap
    • Open the fill cap to create airflow, letting oil drain more completely.
  2. Locate and Remove the Drain Bolt
    • The drain bolt (13mm) is on the lower right side of the motor.
    • Place your oil catch pan beneath and use the 13mm socket/wrench to remove the bolt carefully.
    • Don't lose the washer; it should come off with the bolt. Allow oil to drain fully for several minutes.
  3. Inspect, Clean, and Replace Washer
    • Clean the magnetic drain plug of any metal particles. Some fragments are normal; lots of debris could indicate problems.
    • Replace the crush washer to prevent leaks.
  4. Reinstall the Drain Bolt
    • Screw the drain bolt back in by hand to prevent cross-threading.
    • Torque the bolt to 20 Nm (14.8 ft-lb).
  5. Refill with Fresh Gear Oil
    • Using a funnel, pour in 0.8 liters (800ml) of KTM-recommended gear oil into the fill hole.
    • Do not overfill. If your bike has an oil-level check bolt (8mm, located on the side cover), open this briefly: once oil starts to dribble from the opening, the correct level is reached. Tighten the check bolt to 10 Nm (7.4 ft-lb).
  6. Secure Everything
    • Reinstall and snug the oil fill cap. KTM recommends using pliers to snug it so it doesn't vibrate loose.
  7. Wipe Down and Inspect
    • Thoroughly wipe any spilled oil and check for leaks around the drain and fill areas.

Special Notes for the 2018 KTM 300XC

  • This model shares its oil change procedure with 2017–2018 KTM 250/300 XC/XC-W models. The gearbox oil spec, drain/fill plug sizing, and torque specs are the same.
  • Watch the washer. Always renew the washer on the drain bolt to avoid annoying leaks.
  • With skid plates: If you have a bulky plate, you can tilt the bike to 45 degrees to access the drain and avoid a full skid plate removal.
  • Magnetic drain bolt is standard—expect small debris, but not "furry" buildup each change.
  • KTM's recommended torque settings are 20 Nm for the drain bolt, 10 Nm for the side level check bolt.

Aftercare & Tips

  • Always dispose of old gear oil responsibly at your local recycling center.
  • Record the date and engine hour/mileage of each oil change for your maintenance log.
  • KTM recommends checking and changing the oil at regular intervals, especially after wet or muddy rides.
  • If you see milky oil, inspect for possible water infiltration and resolve immediately.

Conclusion

Your 2018 KTM 300XC deserves clean, fresh oil to deliver the performance KTM is known for. By following the steps above and watching for model-specific tips, you can confidently complete this maintenance at home—keeping your ride crisp and trouble-free on every trail.

This guide is proprietary to MotoSport.com and intended for KTM 300XC owners and enthusiasts.

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Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.