How to Change the Oil in a 2020 Honda CRF450RW

Shop parts for a 2020 Honda CRF450RW Dirt Bike.

Routine oil changes are critical to maintaining the performance and longevity of your 2020 Honda CRF450RW. Honda recommends changing the oil and filter every six races or every 15 hours of riding. Below is a detailed step-by-step guide tailored specifically for the 2020 CRF450RW, including all necessary tools, parts, and key model-specific notes.

Tools & Parts Needed

  • 8mm socket
  • 10mm socket (usually a 10mm for the drain bolt and possibly engine covers)
  • Ratchet and extension
  • Torque wrench (for re-tightening bolts per spec)
  • Drain pan
  • Rags or shop towels
  • Rubber gloves (optional, but helps keep hands clean)
  • New Honda oil filter
  • New crush washer (for drain bolt)
  • New O-ring (for oil filter cover, recommended)
  • Honda 20W-50 engine oil (about 1.2 quarts for this model)
  • Funnel (helps prevent mess)
  • Contact cleaner (to clean up any spilled oil)

Preparation Steps

  • Warm up the engine: Start your bike and let it idle for about three minutes. Warm oil drains more easily and thoroughly from the engine (never allow the bike to get so hot you can't work safely)

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  • Ensure you have a well-ventilated and stable workspace. Use a motorcycle stand if available.

Step-by-Step Oil Change Procedure

  1. Remove the skid plate and left engine guard (if present): Use the appropriate sockets to remove any guards or covers obstructing the oil filter or drain bolt

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  2. Remove the oil filler cap: This allows air to enter as oil drains, ensuring a quicker and more complete drain

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  3. Place the drain pan beneath the engine.
  4. Remove the oil drain bolt: Use your 10mm socket to remove the drain bolt at the lower rear of the crankcase. Be mindful of the oil's temperature. Let the oil drain completely. Inspect and replace the crush washer to prevent leaks

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  5. Remove the oil filter cover: Using the 8mm socket (or as needed), remove the left side engine guard and the two bolts securing the oil filter cover. Remove the cover and take out the old oil filter

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  6. Inspect and replace the oil filter and O-ring: Discard the used filter and replace it with a new, Honda OEM filter. Lightly oil the new O-ring before installing it on the filter cover for a proper seal

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  7. Reinstall the oil filter cover: Secure the cover using the two bolts. Torque them to 9 foot-pounds to avoid deforming the cover

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  8. Reinstall the drain bolt: Once the oil has fully drained, reinstall the drain bolt with a new crush washer. Tighten it securely but do not overtighten, as this could strip the threads

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  9. Replace the engine guards/skid plate: If you removed any, reinstall them now

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  10. Add new oil: Using a funnel, pour in about 1.2 quarts (1.14 liters) of Honda 20W-50 oil. Check your owner's manual for the precise capacity. Do not overfill

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  11. Check the oil level: Let the oil settle for a minute, then check the level through the sight glass on the crankcase just below the oil filter cover. Add oil as necessary to reach the correct level

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  12. Replace the oil filler cap.
  13. Start the engine: Run the bike for 2-3 minutes. Shut it off, let it sit for another minute, then recheck the oil level and top off if needed

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2020 CRF450RW Model-Specific Call-outs

  • This model has a specific oil capacity—1.2 quarts (1.14 liters) is generally sufficient, but always verify using the sight glass.
  • Bolts should be tightened to the manufacturer's recommended torque specs—9 ft-lbs for the oil filter cover

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  • Replacing the crush washer each oil change helps prevent leaks at the drain bolt.
  • If you use aftermarket guards or skid plates, additional steps may be needed for removal and reinstallation.
  • Always use genuine Honda filters and properly rated oil to maintain engine health and warranty.

Tips for Success

  • Always dispose of used oil and filters at an approved recycling center.
  • Wear gloves to avoid skin contact with used oil.
  • Clean any spilled oil thoroughly to avoid slips and maintain a clean work area.
  • Keep a record of your oil changes to stay on schedule.

By following these simple steps and model-specific tips, you can confidently perform an oil change on your 2020 Honda CRF450RW and keep your bike running at its best.

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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.