How to Change the Oil on a 2018 KTM 350SXF

Shop parts for a 2018 KTM 350SXF Dirt Bike.

Regularly changing the oil in your 2018 KTM 350SXF is one of the most essential maintenance tasks you can perform to keep your bike running at its peak performance. This comprehensive guide, proprietary to MotoSport.com, walks you step-by-step through the oil change process specifically for the 350SXF, detailing each tool needed, the steps to follow, and highlighting any model-specific notes to ensure you get the job done right.

Tools and Supplies Needed

  • 10mm and 13mm sockets or T-handle wrench
  • 8mm socket or wrench (for oil filter cover bolts)
  • Torque wrench
  • Oil drain pan
  • Contact cleaner
  • Pick tool (for oil screen removal)
  • New oil filter
  • New crush washer
  • Quality motorcycle oil (10W-50 recommended, check owner's manual for specifics)
  • Paper funnel
  • Clean rags/towels
  • Measuring cup (for precise oil quantity)
  • Gloves (optional, but recommended)

Before You Start

  • Warm up your engine for a few minutes. This helps the oil flow out more easily and removes debris.
  • Place the bike on a clean, solid stand with the engine off and the bike upright.

Step-By-Step Oil Change Instructions

  1. Remove the Skid Plate (if equipped):
    • If your 2018 KTM 350SXF has a skid plate installed, remove it for better access to the oil drain plug.
  2. Drain the Oil:
    • Locate the magnetic drain bolt underneath the engine. Place your oil drain pan under it.
    • Using your T-handle or socket, remove the bolt and let the oil drain completely. The magnetic tip of the bolt captures metallic debris; clean this off before reinstalling.
  3. Remove and Clean the Oil Screen:
    • The KTM 350SXF features an oil screen (strainer) that needs attention every oil change. Use a 13mm wrench or T-handle to remove the oil screen plug.
    • If the screen is stuck, use your pick tool carefully to extract it.
    • Clean off any debris or metal fragments from the screen with contact cleaner until spotless before reinstalling.
  4. Replace the Crush Washer and Re-Install Drain Plug and Oil Screen:
    • Install a new crush washer on the drain bolt to prevent leaks.
    • Hand-thread the plug and screen, then use a torque wrench to tighten each to the manufacturer's specified setting (check the 2018 KTM 350SXF owner's manual for exact torque, but typical values are 10-15 ft-lbs for drain bolts).
  5. Replace the Oil Filter:
    • Locate the oil filter cover on the side of the engine. Remove the two 8mm bolts securing the cover.
    • Pull out the old oil filter. Some riders use needle-nose pliers for this; KTM also sells a filter puller tool.
    • Wipe any oil and debris from the filter housing. Insert the new oil filter in the proper orientation and reinstall the cover, tightening the bolts to spec.
  6. Add New Oil:
    • Remove the oil fill cap. Using a clean funnel, pour the recommended amount of 10W-50 oil (about 1 liter for the 350SXF, but always confirm the correct volume in your manual).
    • Do not overfill. If using a measuring cup, pour a little less and top off after cycling the engine.
  7. Prime and Check Oil:
    • Some riders like to pre-fill the oil filter with oil; this is optional, but ensures immediate lubrication on first startup.
    • Reinstall the fill cap, start the bike for 1-2 minutes to allow oil to circulate (do not rev the engine).
    • Shut off the bike and let it sit upright for a minute. Use the sight glass or dipstick to check oil level and top off if needed. The bike should be level for accurate reading.
  8. Final Checks and Clean Up:
    • Inspect for oil leaks at the drain plug, oil filter cover, and oil screen plug. Check torque once more if any seepage.
    • Clean oil spills off your frame and engine with contact cleaner.
    • Reinstall the skid plate (if applicable).
    • Dispose of used oil properly at an authorized recycling center.

2018 KTM 350SXF Model-Specific Call-Outs

  • This model uses two oil screens: one on the left (13mm plug) and a small mesh screen on the bottom. Make sure to clean both.
  • The drain bolt is magnetic, which helps identify early signs of engine wear by trapped metal shavings.
  • The oil filter orientation is critical—ensure the rubber seal faces outward (toward the cover).
  • The recommended oil capacity is typically 1.1 liters for complete changes, but always check and fill to the correct level using the sight glass for accuracy.
  • Torque specs differ by year; for a 2018 350SXF, drain and screen bolts generally spec to 10–15 ft-lbs, oil filter cover bolts to about 7 ft-lbs–check your manual.
  • Oil change intervals: Every 15 hours minimum, but most riders change it sooner for optimal protection.

Conclusion

Changing the oil on your 2018 KTM 350SXF is straightforward, but attention to detail—especially with oil screens and correct oil quantity—is key to engine longevity. Always use high-quality oil and original filters for best results, and regularly inspect for excess metal on your magnetic drain bolt as an early warning system. With your race-ready 350SXF, proper maintenance like this ensures reliable power and long engine life every ride.

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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.