How to Change the Oil in a 2018 Yamaha YZ250F: Step–by–Step Guide

Shop parts for a 2018 Yamaha YZ250F Dirt Bike.

Changing the oil in your 2018 Yamaha YZ250F is a straightforward maintenance task that ensures your engine stays well–lubricated and protected, extending its life and keeping performance at its peak. Read on for a complete, proprietary guide—brought to you by MotoSport.com—detailing every tool and step you'll need, as well as specific notes for your YZ250F's unique requirements.

Tools and Materials Needed

  • Engine oil: Yamalube 10W-40 (or equivalent, check owner's manual for spec)
  • Oil filter: Yamaha OEM or aftermarket (e.g., K&N KN-140)
  • Socket wrenches:
    • 12mm (oil drain bolt)
    • 8mm (oil filter cover bolts)
    • 10mm (oil strainer bolt)
  • Torque wrench
  • Measuring cup or funnel with gauge
  • Drain pan
  • Crush washer (replacement recommended for drain bolt)
  • Clean rags
  • Rubber gloves (optional, for cleanliness)
  • Owner's manual (for specs and torque values)

Before You Begin: YZ250F–Specific Call-Outs

  • The 2018 YZ250F uses a wet sump system, with an oil strainer and a replaceable cartridge oil filter.
  • The oil capacity is approximately 1.05 quarts (1.0L) with filter change—always check your manual.
  • The oil drain plug is located on the bottom right of the engine case, near the frame rail.
  • The oil strainer should be removed and cleaned at every other oil change for optimal performance.
  • Always warm the engine before draining for better oil flow—run the bike for 3-5 minutes or take a short ride.

Step–by–Step Oil Change Procedure

  1. Warm Up the Engine
    • Start the bike and let it idle gently for 3-5 minutes.
    • This thins the oil, allowing it to drain more completely from all engine components.
    • Turn off the engine and place the bike upright on a stand.
  2. Remove Skid Plate (if equipped)
    • This gives you unobstructed access to the drain bolt and minimizes mess.
  3. Drain the Oil
    • Place a drain pan beneath the engine's drain plug.
    • With a 12mm socket, carefully loosen and remove the drain bolt. Watch for hot oil.
    • Remove the oil filler cap on top of the engine to help oil flow faster.
    • Let the oil drain completely—this might take a few minutes.
  4. Remove and Replace the Oil Filter
    • The oil filter cover is on the side of the engine, held with three 8mm bolts.
    • Remove the bolts and the cover. Be prepared for more oil to seep out—keep the pan underneath.
    • Pull out the old filter and dispose of it properly.
    • Check the filter cover O-ring for cracks or wear—replace if necessary to prevent leaks.
    • Install the new oil filter, noting any directional markings—on the YZ250F, the open end usually faces out toward you.
    • Reinstall the cover and torque the bolts to the specification listed in your owner's manual.
  5. Clean the Oil Strainer (Recommended at Least Every Other Change)
    • This sits on the left side of the engine and is removed with a 10mm bolt.
    • Carefully pull out the strainer, clean it thoroughly with a solvent, and inspect for debris.
    • Reinstall and torque to spec.
  6. Reinstall the Drain Plug
    • Inspect the crush washer; replace if needed.
    • Thread the bolt in by hand to avoid cross-threading, then torque with a wrench to specification.
  7. Refill the Engine with Oil
    • With a funnel, pour in the recommended amount of fresh oil through the fill cap—typically about 1.0L for the 2018 YZ250F with filter change.
    • Use the sight glass (on the right side of the engine) to check oil level. The bike must be upright, not on the side stand.
    • The oil should be between the upper and lower marks on the sight glass.
  8. Run the Engine and Check for Leaks
    • Install and tighten the oil fill cap.
    • Start the engine and let idle for 1-2 minutes, checking for any oil leaks around the drain bolt, filter cover, and strainer.
    • Shut off and allow the bike to sit for a minute. Re-check the oil level, topping off if needed.
  9. Dispose of Old Oil Properly
    • Transfer old oil to a sealed container and take it to a recycling facility or appropriate disposal site.

Final Tips and Model–Specific Reminders

  • Always use a torque wrench for critical bolts: over-tightening can crack engine casings, under-tightening risks leaks.
  • The 2018 YZ250F is known for a robust engine, but regular oil changes (every 5-10 hours of riding, or sooner in harsh conditions) are essential for longevity.
  • If you notice dirty oil after a few hours, consider changing sooner—MX riding is hard on lubricants.
  • If you ride in harsh or wet environments, inspect the oil strainer more frequently.

Changing your oil is the simplest insurance you can give your Yamaha YZ250F's engine. Trust MotoSport.com for all your tools, filters, and Yamalube needs.

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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.