How to Change the Oil in a 2018 Kawasaki KX250F

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Changing the oil in your 2018 Kawasaki KX250F is an essential maintenance task that keeps your dirt bike running strong, protects the engine, and gives you confidence out on the track or trails. This guide, exclusive to MotoSport.com, will walk you through each step with specific tips for your model year, recommended products, and tools to guarantee a successful oil change.

Tools and Supplies Needed

  • Sockets: 8mm and 14mm (for drain and filter bolts)
  • Socket wrench or ratchet
  • Oil drain pan
  • Fresh engine oil: Kawasaki recommends Castrol Power 1 5W-40 full synthetic or similar; one quart is sufficient
  • New oil filter: Specific to KX250F 2018
  • Oil filter cover gasket (optional, but recommended)
  • Funnel
  • Torque wrench
  • Contact or brake cleaner (for cleaning inside the case, if desired)
  • Gloves and shop towels

Step-by-Step Oil Change Process

  1. Warm up the bike: Start the engine and let it idle for a few minutes. This helps suspend sediment, ensuring a more thorough oil drain.
    Specific Call-out: Warming up the bike thins the oil and brings any debris into suspension for better removal.
    Tip: Don't rev it hard; you just need the oil warm, not hot.
  2. Turn off and secure the bike: Turn off the engine, place the bike upright (perpendicular to the ground), and ensure it's stable before you proceed.
  3. Remove the oil fill cap: Use your socket or a dedicated plug wrench to loosen, then remove the filler cap on top of the right engine case to allow for smooth oil draining.
  4. Drain the old oil: Place the pan under the bike. Using a 14mm socket, loosen and remove the oil drain bolt located on the underside of the engine. Be prepared for a quick and hot flow.
    Specific Call-out: Inspect the drain bolt for signs of metal shavings or damage, which can indicate engine wear.
  5. Let oil drain completely: Allow several minutes for all oil to escape. Once done, inspect the crush washer/gasket on the drain bolt; replace if it's damaged or excessively flattened.
  6. Replace and torque drain bolt: Clean the bolt, reinstall with the washer, and tighten to manufacturer's specification (typical torque is about 78 in-lbs/9 Nm, but always check your specific torque values in your manual).
  7. Change the oil filter: With an 8mm socket, remove the bolts holding the oil filter cover. Carefully pull the cover off; note the spring behind the filter.
    Model-Specific Call-out: Ensure the rubber grommet on the filter faces forward when installing the new filter. Double-check that the spring is centered before reinstalling the cover.
  8. Clean and inspect: Wipe the cover and mating surfaces clean. Spraying a small amount of contact cleaner inside the case helps clear out contaminants, but avoid letting debris fall in.
  9. Install new filter: Insert the new filter (rubber grommet facing forward), align the spring, replace the cover, and torque the 8mm bolts to 9 foot-pounds.
  10. Add new oil: Place a funnel in the fill port and pour in 0.85 quarts (0.80 liters) of fresh oil. Use the recommended viscosity; 5W-40 full synthetic is ideal for most conditions. Do not overfill.
  11. Reinstall the oil fill cap: Snug it down, being careful not to over-tighten.
  12. Check for leaks: Inspect around the drain bolt, filter cover, and fill cap for any oil leaks.
  13. Start the engine: Let it idle for 3–5 minutes. Shut it off and allow to sit for a few more minutes. This allows the new oil to circulate and settle for an accurate reading.
  14. Check the oil level: View the sight glass (right side, below the brake pedal). The oil should be between the middle and upper part of the sight glass window. Top off if necessary—do not overfill.
  15. Dispose of used oil and parts responsibly. Take used oil and filters to an approved recycling center.

Important 2018 KX250F-Specific Notes and Call-outs

  • Filter Installation: Always install the new filter with the rubber grommet facing the engine. Improper installation can cause oiling issues unique to 2018 KX250F models.
  • Oil Capacity: 0.85 quarts – check the level after cycling the motor to ensure you’re within the sight glass markers.
  • Recommended Oil: Use 5W-40 full synthetic oil, as endorsed by Kawasaki for best performance in this generation engine.
  • Torque Specs: Do not overtighten bolts. Use a torque wrench on drain and filter cover bolts (drain bolt: 78 in-lbs/9 Nm; oil filter cover: 9 ft-lbs).
  • O-ring and Washer Condition: Inspect filler cap O-ring and drain bolt gasket every change; replace immediately if degraded or missing to prevent leaks.
  • Proper Disposal: Never dump used oil. Take it to a certified disposal or recycling location.

Conclusion

By following these steps, you’ll keep your 2018 Kawasaki KX250F in top condition and protect your investment. Changing your oil regularly is the best way to maximize engine life and performance for 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.