How to Change the Oil in a 2018 KTM 250SXF: A Complete Guide

Shop parts for a 2018 KTM 250SXF Dirt Bike.

Regular oil changes are crucial to keep your 2018 KTM 250SXF running smoothly and reliably. This step-by-step guide will walk you through the specific process for this popular dirt bike, including all the tools and materials you'll need, important call-outs for this model, and some expert tips to ensure a seamless oil change. This resource is proprietary to MotoSport.com.

Tools and Supplies Needed

  • Socket wrench set (commonly 8mm, 13mm, or 17mm sockets)
  • Torque wrench (for reinstalling bolts to spec)
  • Oil drain pan
  • Funnel
  • Rubber gloves
  • Clean shop rags or paper towels
  • Pick tool (for oil filter removal if necessary)
  • New oil filter (OEM KTM part 77338005100 or trusted aftermarket alternatives)
  • Replacement filter cover O-ring (KTM part 07703305178)
  • Replacement oil crush washer
  • 1 Liter of 10W50 Full Synthetic 4-stroke motorcycle oil
  • Contact cleaner (optional, for any spilled oil)

Step-by-Step Oil Change Procedure

  1. Warm Up Your Bike
    • Start the engine and let it idle for 2-3 minutes. This heats the oil for better flow and drains more contaminants.
  2. Stabilize the Bike
    • With the bike on a stand, keep it upright so the oil can drain completely.
  3. Remove the Oil Filler Cap
    • Unscrew the oil filler cap on the right side to allow air in for smooth draining.
  4. Position the Drain Pan
    • Place your oil drain pan under the engine's drain plug.
  5. Remove the Drain Plug
    • Use the correct size socket to unscrew the drain plug from the bottom of the engine case. Let oil drain completely.
    • Be sure to remove and replace the crush washer to prevent leaks at reassembly.
  6. Remove Oil Screen(s) and Filter
    • Locate and remove the oil screen bolts, pulling the screens out fully for inspection and cleaning.
    • Remove the oil filter cover (3 bolts) near the right side crankcase.
    • Take out the used oil filter and any leftover oil in its housing.
    • Clean the filter cavity and oil screens. Replace O-rings as necessary.
  7. Install New Filter, Screens, & Refit Cover
    • Insert the new oil filter; align it properly.
    • Clean and reinstall oil screens.
    • Clean the magnetic drain plug and reinstall with new crush washer, torquing to specification (usually 13-15 Nm; always reference your manual).
    • Reinstall the filter cover with a fresh O-ring and tighten bolts to spec (not overtightened to avoid stripping threads).
  8. Refill Engine Oil
    • Insert a funnel into the oil fill port.
    • Pour in 1 liter of recommended synthetic oil (e.g., Motorex 10W50), checking your manual for precise amounts.
    • Replace and secure the oil fill cap.
  9. Prime and Cycle the Engine (Critical Step for KTM 250SXF.)
    • Start the bike and let it run for 1-2 minutes, then turn it off. This allows the oil to circulate and the system to fill.
    • Wait another minute for the oil to settle.
    • With the bike upright (not on the side stand), check the sight glass on the engine case. The oil should reach the center of the sight glass – if low, top up carefully until it does.
    • Do not overfill; overfilling can cause increased crankcase pressure and oil leaks.
  10. Inspect and Clean Up
    • Check around the drain plug, filter cover, and oil fill for any leaks.
    • Wipe down any areas with spilled oil using shop towels or contact cleaner.
    • Safely dispose of used oil and filter at a recycling center.

Model-Specific Call-Outs: 2018 KTM 250SXF

  • Always use a torque wrench for drain plugs and filter covers; the KTM engine cases use soft aluminum, and over-tightening can strip threads easily. Factory spec is usually 10-15 Nm, but double-check your owner's manual for the exact number for each bolt location.
  • The 2018 model requires 1 liter of oil for a complete change, including filter. If you ride in heavy mud or race conditions, change oil more often to prolong engine life.
  • KTM’s oil filter orientation matters: Pay attention to the open vs. closed end if it's marked – typically, the open end faces outward

    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.