How to Change the Oil in a 2020 Sherco 450 SEF-R

Shop parts for a 2020 Sherco 450 SEF-R Dirt Bike.

Keeping your 2020 Sherco 450 SEF-R running smoothly means regular oil changes to maintain optimum performance and engine longevity. MotoSport.com provides this robust guide to help you confidently change your oil with tools and detailed steps specific to this make and model. Let’s get started.

Tools & Supplies Needed

  • 8mm socket
  • 17mm socket
  • 4mm Allen key
  • Drain pan (to collect used oil)
  • Clean rags or shop towels
  • Torque wrench
  • New oil filter (replace every oil change)
  • New O-rings and crush washers (for plugs and filter cap, as needed)
  • Recommended motor oil:
    • Type: SAE 10W60 (full synthetic is recommended for high-performance bikes)
    • Quantity: 0.9L
  • Gloves (optional, to keep hands clean)

Steps to Change the Oil

  1. Ensure Safety
    Place the bike on a stable stand, engine off and cool to the touch. Gather all tools and ensure the work area is clean and ventilated.
  2. Prepare to Drain Oil
    Place a drain pan under the bike, directly below the oil drain plugs.
  3. Remove Both Oil Drain Plugs
    • Your 2020 Sherco 450 SEF-R has two drain plugs: a standard and a magnetic one, both under the engine. Use the 8mm and 17mm sockets to loosen and remove these plugs. Expect each plug to be paired with a crush washer; inspect and replace these washers as needed to prevent leaks.
  4. Remove the Oil Filter and Pre-Filter
    • Use the 4mm Allen key to remove the oil filter cap. Carefully extract the used oil filter and any pre-filter screen present. Dispose of old filters responsibly.
    • Always replace the oil filter with a fresh one each oil change—it’s essential for proper engine protection.
  5. Allow Oil to Drain Completely
    Let the oil drain for several minutes. Tilting the bike gently may help drain remaining oil from low spots in the engine case.
  6. Inspect & Clean Components
    • Wipe the drain plugs clean.
    • Inspect the magnetic plug for metal shavings; a few tiny particles are normal, but large or excessive debris could indicate internal engine wear.
    • Clean the filter cap, pre-filter, and oil filter housing with a lint-free rag.
  7. Reinstall Drain Plugs and Filters
    • Install new crush washers or O-rings as applicable.
    • Reinstall both drain plugs and torque to specifications:
      • Standard Drain Plug: 22 Nm
      • Magnetic Drain Plug: 15 Nm
    • Insert the new oil filter (observe the correct direction, as shown in your owner’s manual or the photo supplied with your filter), and install the filter cap using a new O-ring. Torque the cap to 15 Nm if specified.
    • Reinstall the pre-filter if present, and secure all related hardware by hand initially, then finish with the torque wrench.
  8. Fill with Fresh Oil
    • Remove the engine oil filler cap.
    • Carefully pour in 0.9 liters of SAE 10W60 motorcycle-specific oil.
    • Reinstall the filler cap.
  9. Check Oil Level and for Leaks
    • Start the engine and let it idle for 1-2 minutes, then shut it off and wait a moment.
    • Check the oil level in the sight glass; the level should sit between the upper and lower marks.
    • Inspect the drain plugs and filter area for leaks.
    • If needed, top off the oil to reach the correct level; do not overfill.
  10. Dispose of Old Oil Responsibly
    Take used oil and filters to a local recycling center or auto parts store with recycling services—never pour oil down the drain or onto the ground.

2020 Sherco 450 SEF-R Model-Specific Call-Outs

  • The 0.9L oil capacity is specific to this year and model–using the correct amount is critical for engine health.
  • Always install new O-rings and crush washers with each oil change to prevent leaks and ensure a reliable seal.
  • This engine features a pre-filter screen in addition to a standard oil filter. Both must be checked and cleaned or replaced during the oil change.
  • Check for metallic debris on the magnetic drain plug each time you change oil. Seeing normal micro-deposits is fine, but large or excessive particles warrant further inspection.
  • Only use high-quality, motorcycle-specific 10W60 oil as this engine is built for high-performance off-road use and standard automotive oils are not formulated for wet clutch systems.
  • If your bike is equipped with an engine guard or skid plate from the factory or aftermarket, removal may be necessary to access both drain plugs.

Conclusion

Changing the oil on your 2020 Sherco 450 SEF-R is straightforward with the right tools and procedures. Following the steps above ensures your engine receives clean, effective lubrication for the demanding performance Sherco riders expect. For all parts, oil, and accessories, shop at MotoSport.com—your trusted source for dirt bike maintenance solutions.

Ride safe and keep your Sherco performing 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.