How to Change the Oil in a 2019 KTM 450SXF – MotoSport.com Proprietary Guide

Shop parts for a 2019 KTM 450SXF Dirt Bike.

Regular oil changes are critical to the longevity and performance of your 2019 KTM 450SXF. This race-bred dirt bike demands clean, properly-filtered oil to perform at its best and avoid expensive engine repairs. Below, you'll find a robust, step-by-step guide, including tools required, model-specific tips, and essential call-outs every KTM 450SXF owner should know.

Tools and Supplies Needed

  • 10mm socket or T-handle – For removing the skid plate
  • 13mm 6-point socket – For removing drain plug(s)
  • 8mm socket – For oil filter cover screws
  • Torque wrench – For proper reinstallation of bolts and plugs
  • Oil drain pan
  • Gloves and shop towels
  • Parts cleaner or brake cleaner (to clean oil screens)
  • New oil filter (specific to KTM 450SXF, KTM part #77338015000 or equivalent)
  • 1.2L 10W-50 Motorex full synthetic oil
  • New crush washer for the drain plug
  • Funnel

Model-Specific Call-Outs for 2019 KTM 450SXF

  • The 2019 KTM 450SXF uses 1.2 liters (about 1.27 quarts) of 10W-50 full synthetic oil(Motorex recommended).
  • This model features two oil screens and a conventional canister-type oil filter.
  • Be meticulous with torque specs. Overtightening filter or drain bolts can strip the cases (torque specs are outlined below).
  • Always ensure the oil filter is installed the correct direction (holes facing the engine side). Incorrect installation can cause catastrophic engine damage.
  • Consider changing both oil screens every other oil change for utmost protection.

Step-by-Step Oil Change Instructions

  1. Warm the Engine
    • Start your KTM 450SXF and let it idle for 2–3 minutes. Warm oil flows better, ensuring a more thorough drain.
    • Turn off the engine and place the bike on a sturdy stand, upright.
  2. Remove the Skid Plate
    • If equipped, use a 10mm socket or T-handle to remove the skid plate bolts and set aside the plate.
  3. Drain the Old Oil
    • Place your drain pan under the engine.
    • Use a 13mm 6-point socket to loosen the drain plug(s) – the main one is located at the bottom of the engine case. Note: 2019 models have two oil screens, each with a 13mm drain plug.
    • Allow the oil to drain fully. Inspect your crush washer and replace if deformed.
  4. Remove and Clean the Oil Screens
    • Use a 13mm socket to unscrew the oil screen plugs at both the ignition and clutch sides.
    • Gently slide out the screens. Be careful not to lose any O-rings.
    • Spray parts cleaner through the screens to remove trapped debris.
  5. Reinstall Oil Screens and Drain Plugs
    • Lubricate O-rings with a drop of fresh oil before reinstallation.
    • Install the cleaned screens and torque the plugs to manufacturer spec:
      • Drain plug (oil screen plug): 15 Nm (11 ft-lb)
  6. Replace the Oil Filter
    • Locate the oil filter on the right side of the engine (just under the exhaust pipe).
    • Remove the two 8mm bolts on the oil filter cover. Remove the cover and filter.
    • Lightly pre-fill your new filter with oil for faster top-end lubrication at first start.
    • Critical: Make sure the filter is installed with the open end facing inward toward the engine. Double-check orientation; failure to install correctly can destroy your engine.
    • Replace the filter cover, torque the bolts to 6 Nm (4.4 ft-lb).
  7. Refill with Fresh Oil
    • Remove the oil fill cap (on the clutch cover's top).
    • Insert a clean funnel and slowly pour in 1.2 liters of 10W-50 full synthetic oil.
    • Replace the oil fill cap.
  8. Reinstall the Skid Plate
    • Reattach the skid plate and tighten its bolts to manufacturer spec.
  9. Check Oil Level and Inspect for Leaks
    • Start the engine and let it run for 30–60 seconds. Shut it off and wait a minute.
    • On level ground, check the oil level at the sight glass (right side of engine). Oil should be in the middle of the glass; top-off as needed but do not overfill.
    • Inspect drain plug and filter cover for any signs of oil leaks. Re-torque if needed.

Pro Tips & Common Mistakes to Avoid

  • Never reuse old crush washers. A leaking drain plug can cause catastrophic engine loss.
  • Always pre-fill your new oil filter slightly to prevent dry start-up.
  • Check for debris in your oil screens every oil change, especially in race or sand/mud conditions.
  • Tighten all bolts to the correct torque specs. KTM case threads are soft, and stripping them is a costly mistake.
  • If you see metal shavings in your drained oil or screens, consult a mechanic to avoid potential engine failure.

Conclusion

Changing the oil on your 2019 KTM 450SXF is foundational maintenance that keeps your ride fast, reliable, and race-ready. Meticulous attention to detail—especially with filter orientation and torque specs—will ensure your engine lives a long, healthy life. For all KTM service or upgrade parts, trust MotoSport.com for the best fitment and expert support.

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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.