How to Change the Oil in a 2020 KTM 250SX: Complete Guide

Shop parts for a 2020 KTM 250SX Dirt Bike.

Changing the oil in your 2020 KTM 250SX is one of the most essential maintenance tasks to keep your bike running smoothly and reliably. This guide, exclusive to MotoSport.com, walks you through all the steps, lists the tools you'll need, and highlights KTM-specific requirements and recommendations for this particular year and model.

Tools and Supplies Needed

  • 13mm deep socket and ratchet or T-handle wrench
  • Torque wrench (capable of measuring up to at least 20 Nm/14.8 ft-lb)
  • Oil drain pan
  • Funnel
  • Contact cleaner (for cleanup)
  • Replacement oil filter (OEM part #77338005100 or equivalent)
  • New crush washer for drain plug
  • Recommended engine oil (use high-quality 10W-50; KTM recommends 0.8 – 1L, check your manual for exact fill level)
  • Nitrile gloves (optional, for a cleaner job)
  • Clean rags

Step-by-Step Oil Change Instructions

  • Warm up the engine: Start your KTM 250SX and let it idle for a few minutes to warm the oil, making it easier to drain. Shut the engine off and allow it to cool for a couple of minutes (the engine and oil will get hot; caution is advised)

    .
  • Remove skid plate: If your bike has an aftermarket skid plate installed, remove it to access the drain plug and oil filter.
  • Loosen the oil fill cap: Take off the oil fill cap on the clutch side to allow the oil to drain freely

    .
  • Place oil drain pan: Position it under the drain plug.
  • Remove drain plug: Use the 13mm deep socket to loosen and remove the drain plug and allow the old oil to flow into your pan

    .
    • The plug is magnetic; clean any metallic debris from it (a little is normal).
    • Remove and replace the crush washer to prevent leaks when reinstalling

      .
  • Remove and clean the oil screen: Next to the drain plug is a small oil screen. Remove it with the appropriate tool and clean it with contact cleaner or a clean rag. Look for any metal shavings or debris indicating unusual wear

    .
  • Replace the oil filter:
    • The oil filter is located nearby (refer to your manual for the exact cover location on the right side case).
    • Remove the filter cover bolts carefully.
    • Pull out the old filter and inspect for metal debris (a little is normal).
    • Insert the new filter, making sure it seats properly

      .
    • Refit the cover; ensure the sealing O-ring is in good shape and doesn't get pinched.
    • Tighten the cover bolts evenly to avoid damage, using specifications from your KTM manual.
  • Reinstall and torque the drain plug: Fit the clean, magnetic drain plug with the new crush washer and torque firmly to the manual's specification (typically 20 Nm/14.8 ft-lb for KTM 250s)

    .
  • Refill with oil:
    • Put a funnel into the oil fill hole.
    • Add the manufacturer's recommended oil volume (KTM 250SX: approximately 0.8 – 1.0 liters of 10W-50; always check your sight glass and manual)

      .
    • Optional: Some mechanics pre-fill the new oil filter to reduce dry start-up time, but this is personal preference

      .
  • Prime and check: Before starting, use the starter button for a few seconds (without fully starting the engine) to prime the new filter with oil

    . Check for leaks around the drain plug and filter.
  • Final inspection: Start the engine, let it idle briefly, then turn it off and check the oil level again. Top off if necessary. Inspect for any leaks from all serviced areas.
  • Clean up: Clean off spilled oil from the frame and engine cases using contact cleaner. Dispose of old oil and filters properly.

Model and Year-Specific Call-Outs for the 2020 KTM 250SX

  • Drain plug torque is critical: Over-tightening can strip the aluminum case. Always use a torque wrench and stick to KTM's specs (typically 20 Nm/14.8 ft-lb)

    .
  • Exact oil volume varies: Always double-check levels using the sight glass after running the engine and topping off as needed to prevent under- or over-filling

    .
  • Oil filter orientation matters: When installing a new filter, make sure it is installed in the correct direction—the KTM 250SX's filter is directional and should match the diagram in your owner's manual to ensure proper flow.
  • Be mindful of hot parts: Performing an oil change after warming up is easier, but both the oil and engine parts will be hot—take care to avoid burns.
  • Inspect for unusual wear: While cleaning the magnetic drain plug and oil screen, a small amount of fine debris is normal, but large metal shards or excessive shavings may indicate internal engine wear—contact a KTM-approved technician if you notice anything abnormal.
  • Crush washers are not reusable: Always replace the drain plug's washer to ensure a leak-free seal

    .

Conclusion

Changing the oil on your 2020 KTM 250SX is straightforward and should only take 20–30 minutes. With the right tools and some attention to detail, you can keep your two-stroke KTM running at peak performance. Always consult your bike's service manual for torque specs and proper procedures. Safe riding from your friends at MotoSport.com.

Related Shopping Categories

Shop Motor Oil for a 2020 KTM 250SX Dirt Bike.

Shop Oil Filters for a 2020 KTM 250SX Dirt Bike.

Shop Oil Drain Pans for a 2020 KTM 250SX Dirt Bike.

Shop Tools for a 2020 KTM 250SX Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2020 KTM 250SX 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.