How to Change the Oil in a 2018 KTM 150 XC-W

Shop parts for a 2018 KTM 150 XC-W Dirt Bike.

Keeping your 2018 KTM 150 XC-W in top riding condition means regularly changing its transmission oil. This step-by-step guide is tailored specifically for your 150cc two-stroke KTM and will walk you through every detail you need to complete a safe, mess-free oil change—right from the MotoSport.com garage.

Tools and Materials Needed

  • Drain pan to catch used oil
  • Metric T-handle or socket wrench (primarily an 8mm)
  • Torque wrench
  • Replacement gear oil (about 0.8 liters of a quality two-stroke gear oil as specified by KTM)
  • New crush washer/seal ring for the drain plug
  • Funnel
  • Gloves and rags
  • Contact cleaner (optional, for cleaning any oily mess)
  • Safety glasses (recommended)
  • Skid plate tool if your bike is equipped with a skid plate

Step-by-Step Instructions

  1. Warm Up the Engine
    • Run your KTM for a few minutes to bring the engine to operating temperature. This helps the oil flow out more easily and thoroughly remove contaminants.
      Tip: Perform this in a well-ventilated area.
  2. Park and Secure the Bike
    • Park the motorcycle on a level surface and use a stand to keep it steady.
      Alternatively, you can lean the bike safely against a wall if you don't have a stand.
  3. Remove the Skid Plate (if installed)
    • Take off the skid plate for easier access to the drain plug. This helps prevent mess and ensures you don't damage the plate or plug while working .
  4. Loosen the Oil Fill Cap
    • Remove the oil fill cap before draining—this allows the oil to flow out easily by preventing a vacuum inside the case .
  5. Drain the Old Oil
    • Position your drain pan under the engine.
    • Use your wrench to remove the gear oil drain plug (8mm) located on the underside or side of the engine case. Be careful—if the engine is warm, the oil can be hot .
  6. Inspect and Clean the Drain Plug
    • The drain plug will likely have a magnetized tip—clean off any collected metal debris. Small particles are normal, but anything excessive could indicate trouble .
  7. Replace the Crush Washer/Seal Ring
    • Always install a new crush washer (seal ring) on the drain plug to prevent leaks .
  8. Reinstall the Drain Plug
    • Thread the drain plug in by hand to avoid cross-threading, then torque to KTM's spec: 12 Nm (8.9 ft-lb) .
  9. Add New Oil
    • Use a funnel and pour in 0.8 liters of the manufacturer-recommended gear oil .
  10. Reinstall and Tighten Oil Fill Cap
    • Snug the cap down with a pair of pliers, as KTM advises, to ensure it doesn't loosen during hard riding .
  11. Wipe Up and Reinstall the Skid Plate
    • Clean off any spilled oil from the case or frame. If you removed the skid plate, reinstall it now .
  12. Start and Inspect
    • Start the bike and let it idle for a minute. Check around the drain plug and cover for leaks. Top up if necessary and recheck the oil level through the inspection window, if equipped.

2018 KTM 150 XC-W Model-Specific Call-outs

  • This bike uses a separate gear oil for the transmission. The correct spec and amount (0.8 liters) are crucial—do not overfill or underfill .
  • The magnetic drain plug helps catch internal wear particles. Always inspect it as part of routine maintenance .
  • A new crush washer every oil change is mandatory to prevent leaks .
  • Follow the initial break-in interval (first change after 5 hours) then at least every 40 hours–more often in extreme conditions or frequent racing .
  • If your bike's skid plate is hard to remove, consider aftermarket oil change tools that prevent mess when plate stays on .

Pro Tips from MotoSport.com

  • Oil Disposal: Used oil is hazardous—bring it to an official recycling or auto parts store drop-off.
  • Inspection Opportunity: Check for leaks and inspect for any damage elsewhere while you're under the bike.
  • Always log your maintenance intervals and date—this ensures reliability and helps resale.

Regularly changing your KTM 150 XC-W's oil is one of the best ways to ensure smooth shifting and long gearbox life. MotoSport.com has all the parts and gear you need for a fast, mess-free service. Happy riding.

Related Shopping Categories

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Shop Tools for a 2018 KTM 150 XC-W Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2018 KTM 150 XC-W Dirt Bike.

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.