How to Change the Oil in a 2020 KTM 350 EXC-F

Shop parts for a 2020 KTM 350 EXC-F Dirt Bike.

Regular oil changes are critical to keep your 2020 KTM 350 EXC-F running at peak performance and to extend engine life. The process is straightforward but requires preparation and attention to detail. MotoSport.com brings you a comprehensive, step-by-step guide, including all required tools and special notes unique to the 2020 model.

Tools & Supplies Needed

  • Motorex 10W-50 4T engine oil (or manufacturer-approved alternative)
  • KTM oil filter (part number as per owner's manual)
  • 13mm socket or spanner (for both drain bolt and oil screen plug)
  • Torque wrench (for proper reinstallation torque)
  • Drain pan
  • Rags or shop towels
  • Nitrile gloves
  • Plastic or rubber mallet (if needed, to loosen stubborn bolts)
  • New copper crush washer and O-ring (should be replaced every oil change)
  • Lock ring pliers (recommended for filter removal)
  • Measuring cup (for priming oil filter)

Step-by-Step Oil Change Instructions

  • Warm up the engine: Start your motorcycle and let it run for a few minutes. Warm oil drains faster and carries more debris out of the engine. Turn the bike off and place it on a level stand.
  • Remove the skid plate: Use the appropriate tool to remove the factory skid plate for easy access to the drain bolts (if equipped and in the way).
  • Place the drain pan: Put your drain pan underneath the sump plug, located at the bottom of the engine.
  • Remove the sump plug: Using a 13mm socket or spanner, loosen and remove the drain plug. Be careful—the oil will be hot. The drain plug has a copper washer; replace this washer to prevent leaks

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  • Remove and clean the oil screen: The second bolt with a 13mm head holds the oil screen filter. Remove it carefully—the screen is spring-loaded and will slide out. Inspect, clean with contact cleaner, and reinstall with a new O-ring if needed

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  • Remove the oil filter: Use lock ring pliers or fingers to slide out the oil filter from its housing.
    • Compare the old and new filters to ensure a proper match.
    • Clean the filter cavity of any residue and debris.
  • Prime the filter and housing: Unique KTM procedure—lean the bike onto its right side so the oil filter opening is up. Pour fresh oil into the filter cavity until it's about 1/3 full. Insert the new filter slowly to let the oil soak in, minimizing dry starts

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  • Reinstall the oil filter cap: Ensure the O-ring on the cap is in good shape and properly seated.
  • Reinstall the oil screen and drain plug: Double-check the O-rings and washer. Tighten both to factory torque specs (consult your owner's manual or KTM service manual).
  • Fill with fresh oil: Keeping the bike upright and level, add the recommended amount of Motorex 10W-50 4T engine oil (typically around 1.2 liters, but confirm in your manual). Check the oil sight glass or dipstick as you go.
  • Start the engine and check for leaks: Run the bike for a couple of minutes. Turn it off, let it sit for one minute, and check for leaks at the drain plug, oil screen, and filter cap.
  • Check the oil level: With the bike level, verify the oil level in the sight glass. Add oil if necessary to reach the desired mark.
  • Reinstall the skid plate: Once satisfied, put the skid plate back on securely.

KTM 350 EXC-F (2020) Specific Call-Outs

  • The oil filter priming step is crucial on this model. Skipping this can cause oil starvation for a few seconds on the first start, which can harm internal engine components

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  • Both 13mm bolts–one for the main drain plug and one for the oil screen–must be removed. Many first-time owners may overlook the oil screen, leading to debris buildup.
  • Always use the specified oil—Motorex 10W-50 4T is KTM's recommended oil for this engine

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  • Inspect the magnetic drain plug for metal shavings. Small, fine metal "fuzz" is normal on break-in or after hard use, but larger chunks may indicate internal problems

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  • Replace crush washers and O-rings at every oil change to prevent leaks. Always have spares on hand.
  • Set your engine hour meter or trip odometer to zero to remind you to do the next oil change at the recommended interval: every 15–30 hours, depending on riding style

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Maintaining Your KTM 350 EXC-F

  • Frequent oil and filter changes will keep your engine clean, reduce internal wear, and maintain peak horsepower for years to come.
  • Keep a log of oil changes and parts replaced as part of regular maintenance, especially if you ride off-road or in harsh conditions.
  • If you have just purchased a new bike or have finished running the engine in (the first 2–3 hours), it is absolutely essential to follow this procedure to remove any assembly debris and break-in oil

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For all your oil and maintenance needs, MotoSport.com is your trusted source—your next ride depends on it.

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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.