How to Change the Oil in a 2018 Yamaha WR250F

Shop parts for a 2018 Yamaha WR250F Dirt Bike.

Keeping your 2018 Yamaha WR250F running at peak performance means staying on top of routine maintenance like oil changes. Follow these step-by-step instructions, ensure you have the correct tools and oil, and read the model-specific call-outs for your WR250F. This guide is brought to you exclusively by MotoSport.com.

Tools and Supplies Needed

  • Socket set (8mm, 10mm, 12mm sockets; check your bolt sizes)
  • 5mm Allen key (for oil filter cover bolts)
  • Oil drain pan
  • Funnel
  • New oil filter (recommended: OEM or quality aftermarket)
  • Clean rags or shop towels
  • Fresh engine oil (Check your manual for grade; typical: 10W-40, 1.3 liters with filter change)
  • Torque wrench (for precise assembly)
  • Parts cleaner or brake clean (optional, for cleaning)

Preparation

  • Make sure the engine is warm by idling it for 5-10 minutes. Warm oil drains more effectively and carries away more contaminants.
  • Turn off the bike and allow it to cool slightly to avoid burns.
  • Place the bike on a stable, flat stand. Cleaning the exterior area around the oil fill cap and drain bolts is critical to prevent contaminants from entering the engine.
    Tip: Cleanliness is essential—wipe down around the oil fill and drain bolts before starting.

Step-by-Step Instructions

  1. Remove the skid plate (if equipped):
    Use the correct socket/Allen key to take off your front skid plate for access. Set the hardware aside safely.
  2. Remove the oil filler cap:
    This allows air in and helps the oil drain completely.
  3. Drain the oil:
    - Locate the main engine drain bolt on the right side of the crankcase. Use your socket set to remove it and let the oil drain into your pan. Be careful as the oil will be hot.
    - The WR250F features a separate oil tank (dry sump system). Locate the oil tank drain bolt, often higher up on the frame or reservoir area—use the correct socket (commonly 12mm).
    - For complete drainage, some models may also need the breather bolt or dipstick removed at the top of the oil reservoir to let air in and encourage flow. On the 2018 model, remove the dipstick/breather bolt if flow is slow.
  4. Remove and inspect the oil filter:
    - Use a 5mm Allen key to remove the oil filter cover bolts.
    - Pull out the old filter. Inspect for excessive metal fragments, which can indicate abnormal engine wear.
    - Clean the filter cover and the area around the filter seat.
  5. Replace the oil filter:
    - Insert the new filter in the correct orientation (open side facing out).
    - Lightly oil the new filter’s seal with fresh oil before installation.
    - Reinstall the oil filter cover. Hand-tighten all bolts, then finish with a torque wrench to manufacturer specification (usually 10 Nm/7 ft-lb–check your manual).
  6. Reinstall drain bolts:
    - Thoroughly inspect each bolt and the sealing washers. If damaged, replace them.
    - Thread the drain bolts by hand to prevent cross-threading, then torque to the specified value (consult your manual).
  7. Add new oil:
    - Place a funnel in the filler and add 1.3 liters of the recommended oil grade for a full change with filter replacement.
    - For partial change (if not replacing the filter), add 1.2 liters.
    - Use the oil dipstick or sight glass to check the level, ensuring it reaches the correct mark.
  8. Check for leaks:
    - Reinstall the oil filler cap.
    - Start the engine, let it idle for 1-2 minutes, then shut it off and recheck for leaks around plugs and the oil filter area.
    - Allow oil to settle, then recheck the level and top off if needed.
  9. Reinstall the skid plate and clean up.

Model-Specific WR250F Call-Outs (2018)

  • 2018 WR250F uses a dry-sump lubrication system with an oil reservoir in the frame or a dedicated tank. Ensure you drain from both the main engine and oil tank bolts for a complete change.
  • Oil change interval: Inspect every race; change oil every 1,000 km or sooner as required by riding conditions.
  • Oil capacity with filter change: 1.3 liters; without filter: 1.2 liters.
  • Always check oil strainer screens every few oil changes and inspect for debris in the oil filter.
  • Snug but do not overtighten filter and drain bolts—aluminum threads can strip easily.

Pro Tips

  • Proper warm-up aids oil flow and helps suspend debris for a better drain.
  • Note oil color and debris: Black, gritty, or metallic-laden oil can indicate problems worth professional inspection.
  • Dispose of all used oil and parts responsibly—take used oil to a proper recycling center.

For all your dirt bike maintenance needs, including oil, filters, and tools, trust MotoSport.com—your exclusive source for genuine and aftermarket Yamaha WR250F parts and accessories.

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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.