How to Change the Oil in a 2020 KTM 450 SX-F

Shop parts for a 2020 KTM 450 SX-F Dirt Bike.

Keeping your 2020 KTM 450 SX-F running at peak performance depends heavily on routine oil changes. This robust, step-by-step guide—exclusive to MotoSport.com—details everything you need to know, including necessary tools, best practices, specific model call-outs, and expert tips to maintain your bike’s longevity.

Tools and Supplies Needed

  • 10mm and 13mm socket or wrench (confirm fit for your specific drain bolts)
  • Torque wrench
  • Drain pan (low-profile works best for dirt bikes)
  • Funnel
  • Rags or shop towels
  • New oil filter (recommended OEM or quality equivalent: KTM part # 77338015200)
  • Replacement copper crush washers (for both drain bolts and oil screen plugs)
  • Brake cleaner (optional, for cleaning off any spilled oil)
  • Motorex Cross Power 4T 10W-50 oil, 1.2 liters (per KTM specs)

Step-By-Step Oil Change Instructions for 2020 KTM 450 SX-F

  1. Warm up the Bike
    • Start the engine and let it idle until warmed up (2–3 minutes). Warm oil drains faster and carries away more contaminants.
      Tip: Avoid getting the engine too hot to prevent burns during the process.
  2. Remove Skid Plate (If Installed)
    • Use your appropriate wrench or Allen key to remove any aftermarket or OEM skid plate for better access to the drain plugs.
      Note: Factory KTM models often require this step for clear access.
  3. Position Drain Pan and Remove Oil Drain Bolts
    • Locate the crankcase drain plug (13mm, right side under the engine) and gearbox drain plug (left side, if equipped). Place a drain pan below the lowest point.
    • Loosen, then remove the plugs and let the oil fully drain.
      Model Call-out: The 2020 KTM 450 SX-F has two oil screens (not just a single drain bolt). Remove both screens for a thorough oil change.
    • Replace the copper crush washers to ensure a leak-free seal after draining.
  4. Remove and Inspect Oil Screens
    • With the oil drained, remove both oil screen plugs using your socket (10mm).
      Inspect screens for debris. Clean thoroughly with brake cleaner and allow to dry.
  5. Change the Oil Filter
    • Remove the oil filter cover on the right side of the engine (8mm or 10mm bolts, confirm for your year).
    • Pull out the used filter. Check the orientation of the filter before removal (open hole must face into the engine, not the cover)—installing backwards can cause catastrophic top-end damage.
    • Pre-fill the new filter with a small amount of fresh oil. This primes the system and helps prevent dry starts.
    • Lightly oil the filter’s O-ring before installing. Insert the new filter in the correct orientation and reinstall the cover using care not to over-tighten the bolts (consult owner’s manual for torque specs).
  6. Clean and Reinstall Drain Plugs and Screens
    • Clean all mating surfaces of old oil and debris.
    • Reinstall the oil screens and both drain plugs with new washers. Torque to factory specification (refer to the service manual for proper value, typically 10–12 Nm for drain plugs).
  7. Refill with Oil
    • Remove the oil fill cap on the clutch cover (right side).
    • Using a funnel, pour in 1.2 liters (approx. 1.27 US quarts) of 10W-50 fully synthetic oil.
      Model Call-out: Always check for updated specs in your KTM owner’s manual and do not overfill.
  8. Run Engine and Check Oil Level
    • Replace the fill cap, then start and let the engine idle for 2–3 minutes. Shut off and wait a few minutes for the oil to settle.
    • Check the oil level using the sight glass: oil should be between halfway and three-quarters up in the round window (do not exceed the red line). Top off if necessary.
      Tip: Keep bike upright and level when checking.
  9. Reinstall Skid Plate and Final Inspection
    • Reinstall your skid plate if equipped, ensuring all fasteners are secure.
    • Check for leaks at the drain bolts, oil filter cover, and oil fill cap. Wipe off excess oil.

2020 KTM 450 SX-F Oil Change Tips and Model Call-Outs

  • Dual Oil Screens: The 2020 KTM 450 SX-F uses two oil screens in addition to the regular oil filter. Both must be cleaned at every oil change for best protection.
  • Priming the Oil Filter: Pre-soaking and installing the filter in the correct direction is essential to avoid engine damage and dry starts. The open end must face into the engine.
  • Proper Oil Level: Always use the sight glass for the final oil level check after running the engine; do not trust the initial fill alone.
  • Torque Settings: Always use the correct torque spec for drain plugs to avoid stripping threads in the soft aluminum cases.
  • Routine Checks: Change oil and filter every 5–10 hours for racing or every 15 hours for recreational trail use to extend engine life.

Doing your own KTM 450 SX-F oil change isn’t just a great way to save money—it helps you spot potential mechanical issues before they become major headaches. Stick to this guide from MotoSport.com, always use the highest quality parts and fluids, and your 2020 KTM 450 SX-F will keep running hard for many seasons.

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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.