How to Change the Oil in a 2019 Honda CRF450RW

Shop parts for a 2019 Honda CRF450RW Dirt Bike.

If you own a 2019 Honda CRF450RW, keeping up with oil changes is critical to ensuring longevity and reliable performance from your dirt bike. Changing the oil is a straightforward maintenance procedure that can be done in your own garage with basic tools. This step-by-step guide covers the process, the tools you'll need, and specific tips that apply to your 2019 CRF450RW model.

Tools and Supplies Required

  • 10mm socket and ratchet
  • 8mm socket (for some models and covers)
  • 10mm Allen (Hex) wrench (for oil drain bolt)
  • Torque wrench (recommended for reassembly)
  • Oil drain pan
  • Honda oil filter (OEM recommended)
  • Crush washer (new, for drain bolt)
  • O-ring (for oil filter cap, if replacement needed)
  • Honda 20W-50 motorcycle engine oil (see owner's manual for oil type and quantity–typically just under 1 quart for engine side)
  • Shop towels/rags
  • Funnel
  • Gloves (optional, but recommended for cleanliness)

Step-by-Step Procedure

  1. Warm up the Engine.

    Start your dirt bike and let it idle for a few minutes. Warming up the engine helps suspend contaminants in the oil and allows it to drain out more thoroughly.
    Tip: Never perform an oil change with a hot engine—aim for ‘warm’.
    Model Note: The CRF450RW shares similar steps to the RX and R models regarding engine access and drainage, but always check for subtle differences in the manual.

  2. Remove the Skid Plate or Engine Guard.

    Use your 10mm socket to remove the three bolts securing the left-side engine guard or skid plate: one on each side and one underneath. Set the guard aside to expose the oil drain bolt and oil filter cover.
    Model Note: The drain plug may be large and somewhat messy; have your drain pan ready and rags handy to catch spillage.

  3. Remove the Oil Filler Cap.

    Unscrew the oil filler cap (located on top of the engine) to help oil drain smoothly and prevent vacuum lock.

  4. Drain the Old Oil.

    Position your drain pan directly underneath the engine. Use the 10mm hex/Allen wrench to remove the large oil drain bolt at the lower rear of the crankcase. Let all old oil fully drain.
    Tip: Always replace the crush washer on the drain bolt to ensure a proper seal and avoid leaks.

  5. Replace the Oil Filter.

    Remove the bolts (typically 8mm or 10mm) securing the oil filter cover. Remove the cover, then pull out the old oil filter. If present, remove the old O-ring and replace it with a new one for best results.
    Install the new oil filter (pay attention to the orientation; the rubber seal faces outward). Reinstall the oil filter cover and torque the bolts gently, typically to 9 ft-lb. Do not overtighten to avoid damage or leaks.

  6. Reinstall the Drain Bolt.

    Once oil has fully drained, reinstall the drain bolt with the new crush washer. Tighten it per manufacturer specifications (check your service manual for exact torque specs, but usually just snug–overtightening can strip threads or crush gasket).

  7. Add New Engine Oil.

    Place a funnel in the filler hole. Pour in Honda 20W-50 engine oil. Reference the owner's manual for correct oil volume, but a common fill amount is just under 1 quart (950ml). On some models, overfilling the transmission side by a small margin (but not the engine side) is a common practice for added protection, though follow Honda's specified limits for best results.

  8. Check Oil Level.

    Allow oil to settle for a minute, then check the sight glass or dipstick (if equipped). Add oil until the correct level is reached. Be careful not to overfill.
    Model Call-Out: The sight glass is located just below the oil filter cover on the crankcase–verify level visually. Top up if necessary.

  9. Run and Recheck.

    Install the filler cap, start the bike, and let it idle for 1-2 minutes. Shut off and allow the oil to settle again. Double-check for leaks at the drain bolt and filter cover. Check the oil level and top off if needed.

  10. Reinstall Skid Plate or Guard.

    Reinstall the engine guard/skid plate with the three bolts removed earlier. Tighten all fasteners as required.

2019 Honda CRF450RW Specific Tips

  • Oil Drain Plug: Large size, drains quickly, be prepared to catch the flow as it can be messier than expected. Always use a new crush washer to prevent leaks.
  • Oil Filter Orientation: Ensure the filter rubber seal faces outward during installation.
  • Oil Volume: While general wisdom among owners might be to slightly overfill the transmission side on models with split oil, stick with Honda's recommended engine oil capacity for the 2019 CRF450RW.
  • Maintenance Interval: Engine oil and filter should be changed every 15 hours of operation or after every six races, whichever comes first.

Disposal and Safety

  • Dispose of used oil and filters at authorized recycling centers–never pour oil on the ground or down drains.
  • Wear gloves to avoid skin contact with used oil.

Final Thoughts

  • Routine oil changes are a fundamental part of caring for your 2019 Honda CRF450RW and will help extend the life of your engine.
  • Keep a maintenance log with the date and hours since the last oil change for reference.

Related Shopping Categories

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Shop Oil Fillers and Drain Plugs for a 2019 Honda CRF450RW 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.