How to Change the Oil in a 2018 KTM 300 XC-W

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Keeping the oil fresh in your 2018 KTM 300 XC-W is essential for optimal performance and long engine life. While the 300 XC-W is a two-stroke engine, changing the transmission (gearbox) oil is a critical maintenance step every owner should master. This blog will detail all the tools you need, step-by-step instructions, and important model-specific tips for a seamless oil change, exclusively for MotoSport.com readers.

Tools and Materials Needed

  • 13mm socket/wrench – for the drain bolt
  • 8mm socket/wrench – for the oil level bolt
  • Drain pan
  • Funnel
  • Measuring cup (with 100 mL graduations)
  • New gear oil – 75W/80 GL-4/GL-5 recommended, check your owner's manual for specifics
  • Replacement crush washer (optional but recommended)
  • Clean rags
  • Torque wrench
  • Bike stand or a suitable way to keep the bike upright and level

Step-by-Step Instructions

  1. Warm Up the Engine (Optional)
    • Run the engine for a few minutes to warm the oil. This helps it drain out more completely.
  2. Position the Bike
    • Place your KTM 300 XC-W on a level surface, preferably using a bike stand to keep it upright and stable.
    • If you have a skid plate installed, you may be able to leave it on, but check that you can access the drain bolt easily.
  3. Remove the Drain Bolt
    • On the right side of the engine, locate the 13mm drain bolt near the bottom of the cases.
    • Carefully loosen and remove the drain bolt. Don't forget the crush washer underneath.
    • Allow the oil to fully drain into your drain pan. This usually takes about five minutes.
  4. Inspect and Replace Washer
    • Check the crush washer for damage or crushing. Replacing it is advised to prevent leaks.
  5. Reinstall the Drain Bolt
    • Once the oil is fully drained, reinstall the drain bolt with a clean or new washer.
    • Tighten the bolt to 20 Nm (Newton meters) using your torque wrench

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  6. Remove the Oil Level Bolt
    • Locate the 8mm oil level check bolt on the right-side engine case.
    • Remove this bolt. You'll use it to confirm you have the correct oil level when filling.
  7. Add Fresh Oil
    • Using your funnel and measuring cup, carefully add 800 mL of recommended gear oil through the oil fill hole.
    • Fill slowly and watch for oil to trickle from the oil level hole. Stop filling when it begins to spill out the hole—the gearbox is full

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  8. Replace the Oil Level Bolt
    • Install and tighten the oil level check bolt to 10 Nm with your torque wrench

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  9. Clean Up and Check for Leaks
    • Wipe down the area with a clean rag. Start the bike and let it idle for a minute, then check for any leaks around the drain or level bolts.

Model-Specific Tips for the 2018 KTM 300 XC-W

  • Oil Capacity: The correct fill is 800 mL for the 2017 and 2018 300 XC-W models

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  • Drain and Level Bolts: Use a 13mm socket for the drain bolt and an 8mm socket for the oil level check bolt. The level bolt is located above the drain plug and is easy to identify.
  • Washer Usage: Always use a washer with the drain bolt to prevent leaks. A new copper or aluminum washer is inexpensive insurance.
  • Torque Specs: Over-tightening these bolts can strip the case. Always use a torque wrench and stick to the specified values: 20 Nm for the drain bolt and 10 Nm for the level bolt

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  • Oil Change Interval: Although KTM recommends intervals up to 40 hours in the owner's manual, changing every 10–15 hours is considered best practice for harsh use or racing—oil changes are quick and cheap on these two-strokes

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  • Drain With Skid Plate: If you have a skid plate, you can usually still access the drain plug without removing it. Tilting the bike slightly can help the last of the oil drain out completely

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Final Checks and First Ride

  • After your oil change, take a brief ride and double-check for leaks at both bolts.
  • Dispose of the old oil responsibly by taking it to a recycling center or auto shop that handles used oil.

Changing the transmission oil in your 2018 KTM 300 XC-W is a straightforward job that can save you money and extend the life of your bike. With the right tools, the correct oil, and attention to detail, you'll keep your KTM running perfectly from trail to track. For more expert tech tips and the best OEM and aftermarket parts, trust MotoSport.com for everything dirt bike.

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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.