How to Change the Oil in a 2018 Honda CRF450R: MotoSport.com Complete Guide

Shop parts for a 2018 Honda CRF450R Dirt Bike.

Changing the oil in your 2018 Honda CRF450R is a crucial maintenance task to ensure optimal performance, engine longevity, and smooth operation. This robust step-by-step guide is tailored specifically for your bike and features proprietary expertise for MotoSport.com readers. Whether you're a track regular or trail rider, these instructions will keep you rolling strong.

Tools and Supplies Needed

  • 8mm and 10mm sockets
  • Ratchet
  • Torque wrench
  • Drain pan
  • Shop rags
  • Honda oil filter (OEM recommended)
  • Honda 20W-50 motor oil (1.2 quarts required)
  • New crush washer for drain bolt
  • O-ring for oil filter cover (recommended)
  • Gloves (optional for cleanliness)

Before You Begin: 2018 CRF450R-Specific Callouts

  • Honda recommends changing oil and the filter every 6 race hours or 15 hours of use for the 2018 CRF450R to ensure maximum engine protection

    .
  • The oil fill port and sight glass are located on the left crankcase cover, just below the oil filter housing

    .
  • Factory oil capacity is 1.2 quarts but always check with the sight glass and refer to your owner's manual for confirmation

    .

Step-by-Step Oil Change Instructions

  1. Warm Up the Engine
    • Start the bike and let it idle for 2-3 minutes. This helps the oil thin out, ensuring a more complete drain

      .
    • Turn the ignition off and place your bike on a stable stand.
  2. Remove Engine Guard or Skid Plate
    • Use the 8mm or 10mm sockets to remove any skid plate or engine guard that blocks access to the drain bolt and filter area

      .
  3. Loosen the Oil Filler Cap
    • Take off the oil filler cap to allow air flow and help the crankcase drain efficiently

      .
  4. Drain the Old Oil
    • Position a drain pan under the engine.
    • Remove the 10mm drain bolt (lower rear of crankcase) along with its crush washer. Allow oil to drain completely

      .
  5. Replace Crush Washer
    • Always use a new crush washer to prevent future leaks and ensure a proper seal

      .
  6. Remove the Oil Filter
    • Remove the left side engine guard for direct access to the oil filter cover (if present on your bike)

      .
    • Use the appropriate socket or wrench to unscrew the oil filter cover bolts.
    • Pull out the old oil filter. Inspect the old filter for metal shavings or debris, which could indicate internal engine wear.
    • Clean the filter cover and surrounding area with a shop rag.
  7. Install New Oil Filter
    • Put a drop of fresh oil on the new O-ring for the oil filter cover, then position the new filter in place

      .
    • Reinstall the oil filter cover and torque bolts to 9 foot-pounds for a secure fit

      .
    • If the O-ring looks worn, replace it to avoid leaks.
  8. Reinstall the Drain Bolt
    • Install the drain bolt with the new crush washer. Tighten to the manufacturer's specified torque setting (refer to owner's manual, typically around 12 foot-pounds for this model).
  9. Reinstall Skid Plate/Engine Guard
    • Secure the skid plate or engine guard back in place with the original bolts

      .
  10. Add Fresh Oil
    • Pour 1.2 quarts (approx. 1,135ml) of Honda 20W-50 oil into the fill port. If you ride in extreme conditions, consult your manual or MotoSport.com for recommended oil weights.
    • Replace the filler cap.
  11. Check Oil Level
    • Start the engine and let it run for a minute.
    • Turn off and let the oil settle for a minute, then check the oil level using the sight glass.
    • Top off if necessary; avoid overfilling

      .
  12. Inspect for Leaks and Cleanup
    • Wipe down any oil spills and check around the drain bolt and filter cover for drips.
    • Dispose of old oil and the filter responsibly; most auto parts stores accept used oil for recycling.
    • Store your tools and enjoy your newly serviced CRF450R.

Important 2018 Honda CRF450R Model Notes

  • Always use a new O-ring and washer to prevent leaks—this is a known leak point if reused

    .
  • Torque values matter. Overtightening can strip case threads or crack covers. Use a torque wrench on the drain bolt and oil filter cover bolts.
  • Check oil level after sitting; the CRF450R sights glass makes this quick and simple—ensure oil sits at the horizontal line or slightly above when at operating temperature.
  • Keep an eye out for metallic debris in the old oil/filter, as this can signal internal engine wear and should prompt further inspection.
  • Proper oil type and interval matter—follow Honda's recommendations or reach out to MotoSport.com for performance upgrade advice.

Conclusion

With these steps, your 2018 Honda CRF450R will stay in top running condition. For OEM and performance oil filters, oils, and more, MotoSport.com has what you need to keep your bike race-ready all season long.

Related Shopping Categories

Shop Motor Oil for a 2018 Honda CRF450R Dirt Bike.

Shop Oil Filters for a 2018 Honda CRF450R Dirt Bike.

Shop Oil Drain Pans for a 2018 Honda CRF450R Dirt Bike.

Shop Tools for a 2018 Honda CRF450R Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2018 Honda CRF450R Dirt Bike.

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.