How to Change the Oil in a 2018 Yamaha WR250R (Dual Sport): A MotoSport.com Guide

Shop parts for a 2018 Yamaha WR250R Dirt Bike.

Changing the oil in your 2018 Yamaha WR250R is a fundamental maintenance task that's straightforward if you have the right tools and follow the proper steps. This comprehensive guide will walk you through the entire process, call out 250R-specific details, and help you keep your bike in top condition.

Tools & Materials Needed

  • Socket set (for drain bolt and filter cover bolts)
  • Torque wrench (essential for correct tightness)
  • Oil catch pan
  • Funnel
  • Rags or paper towels
  • New oil filter (optional, but highly recommended each change)
  • New drain bolt crush washer (recommended)
  • Pick tool (for removing old O-ring on filter cover)
  • Engine oil: Yamalube 4, SAE 10W-30 or SAE 20W-40, or high-quality equivalent

Model-Specific Callouts for the 2018 Yamaha WR250R

  • The drain plug is located at the bottom of the crankcase.
  • The oil sight glass is on the engine's right side. Fill until the oil level is between the upper and lower marks with the bike upright.
  • Oil capacity: 1.3L (without filter change), 1.4L (with new filter).
  • Replace the O-ring on the oil filter cover if it looks damaged or worn.
  • Torque specs: Drain bolt = 20 Nm; oil filter cover bolts = 10 Nm (or 7.2 ft-lbs, per some sources).

Step-by-Step Instructions

  1. Warm up the Engine
    • Start and run the engine for a few minutes. Warm oil drains more fully and carries out more contamination.
      Tip: Don't let it get too hot—you just want the oil to flow better, not burn your hands.
  2. Stabilize the Bike
    • Turn off the engine and set the bike on a level surface or dirt bike lift so it stands vertical.
    • This ensures a complete drain and an accurate final fill.
  3. Remove the Drain Bolt and Drain the Oil
    • Place your oil catch pan beneath the crankcase.
    • Remove the engine oil filler cap on the right side cover to allow better flow.
    • Loosen and remove the drain bolt (bottom of the engine) and allow all oil to drain.
      Retain or replace the crush washer as needed.
  4. Oil Filter and Cover Removal (Highly Recommended Every Change)
    • Remove three bolts from the oil filter cover (right side, near shifter pedal).
    • Carefully remove the cover; a small amount of oil may spill.
    • Remove the old oil filter. Use a pick tool to gently remove and inspect the O-ring—replace if damaged or worn.
    • Clean the mating surfaces with a towel.
    • Install the new oil filter (ensure open side faces out).
    • Reinstall the cover and tighten bolts evenly in a criss-cross pattern. Torque to spec.
  5. Replace and Tighten the Drain Plug
    • Wipe metal filings or grit from the drain plug.
    • Install a new crush washer if possible.
    • Tighten the drain bolt to 20 Nm.
  6. Refill with Oil
    • Insert a funnel to avoid spills.
    • Pour in 1.3L (no filter change) or 1.4L (with new filter) of 10W-30 or 10W-40 oil, or as your climate/use dictates.
    • Reinstall the filler cap.
  7. Check the Oil Level
    • Start the engine and let it idle for 30 seconds. Shut it off and wait a minute for the oil to drain to the pan.
    • With the bike held upright, check the sight glass—the oil should register between the low and high lines.
      Do not overfill; adjust as necessary.
  8. Final Steps
    • Check all bolts, caps, and for any leaks.
    • Reinstall skid plate (if applicable).
    • Dispose of old oil and filter responsibly.

Additional Tips & Reminders for the WR250R

  • Yamaha recommends oil changes every 3,000 miles and oil filter every 6,000 miles for most users. Aggressive riding or dusty conditions may require more frequent changes.
  • The oil sight glass makes checking easy, but always use a level surface and hold the bike vertical for accuracy.
  • Don't lose the small O-ring on the filter cover—inspecting and replacing as needed prevents leaks.
  • If the skid plate is installed, remove it before you start the job for easier access.

Following these steps will keep your 2018 Yamaha WR250R’s engine running smoothly and reliably, mile after mile.

This guide is proprietary to MotoSport.com

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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.