How to Change the Oil in a 2021 Sherco 300 SEF FACTORY

Shop parts for a 2021 Sherco 300 SEF FACTORY Dirt Bike.

Regular oil changes are key to keeping your Sherco 300 SEF FACTORY running smoothly, protecting the engine, and maximizing performance. This detailed guide—proprietary to MotoSport.com—covers the tools, exact steps, model-specific details, and best practices for changing your oil safely and effectively.

Tools and Supplies Needed

  • 8mm socket (for side covers and screens)
  • 17mm socket (for drain bolts)
  • 4mm Allen/Hex wrench (for certain fasteners)
  • Torque wrench (for correct bolt re-tightening)
  • Drain pan (to catch old oil)
  • New oil filter (recommended every change)
  • New crush washers and O-rings (for drain/fill bolts)
  • Clean shop rags
  • Funnel
  • Gloves (Optional, for cleanliness)
  • Quality engine oil (SAE 10W40, 0.9–1 litre)

Step-by-Step Oil Change Process

  1. Warm Up The Engine Lightly
    • Let the engine idle for 2–3 minutes. This thins the oil for smoother draining. Do not overheat.
    • Turn off ignition and ensure the bike stands upright on a stable stand, preferably level.
  2. Remove Skid Plate (if fitted)
    • If your 300 SEF FACTORY has a skid plate, remove it using your socket set for easier access.
  3. Locate Drain Bolts
    • This model has two drain bolts beneath the engine—one on each side.
    • Position the drain pan underneath both bolts.
  4. Remove Drain Bolts
    • Using a 17mm socket, carefully loosen and remove both drain bolts.
    • Inspect and replace the crush washers if worn—this model uses them to prevent leaks.
    • Allow oil to completely drain (give it several minutes).
  5. Remove Pre-Filters and Oil Filter
    • On the Sherco 300 SEF FACTORY, there are small pre-filters/screens on each drain plug—remove and clean them if reusing.
    • Remove the oil filter cap using the appropriate tool (typically an 8mm socket or 4mm Allen).
    • Carefully extract the old oil filter and discard.
  6. Clean and Inspect
    • Wipe filter cavity and drain bolt threads clean with a rag.
    • Inspect oil for metal fragments or discoloration. Any excessive shavings may signal wear—investigate further if discovered.
  7. Install New Oil Filter(s)
    • Place the new oil filter in the correct orientation. The Sherco manual specifies one direction (check for markings).
    • Replace oil filter cap with a new O-ring if possible and tighten to 15 Nm with the correct socket.
    • Reinstall pre-filters/screens as found and replace their caps, tightening drain bolts to 22 Nm (M19) for the main plug and 15 Nm (M12) for the magnetic plug as indicated.
  8. Refill with Quality Oil
    • Remove the oil filler cap. Insert a funnel and pour in 0.9 to 1 litre of SAE 10W40 oil.
    • Monitor the oil level using the inspection window on the crankcase. Fill until the level sits between the minimum and maximum lines.
  9. Start Engine & Check for Leaks
    • Reinstall the oil filler cap. Briefly start the engine and let it idle for one minute.
    • Shut off the engine and inspect around the drain bolts and filter for leaks.
    • Check oil level again, topping off as necessary.
  10. Dispose of Old Oil Responsibly
    • Pour the used oil into a sealed container and recycle it at an approved waste center. Never dump oil down drains or on the ground.

Sherco 300 SEF FACTORY Model-Specific Call-Outs

  • DRAIN BOLTS: This bike uses two separate oil drain bolts and both must be removed for a complete oil change. Both have crush washers—do not reuse if damaged.
  • OIL CAPACITY: The engine requires 0.9–1 litre of SAE 10W40 oil.
  • OIL FILTER DIRECTION: The filter must be installed in the correct orientation as shown in the owner's manual. Improper installation can cause poor oil flow.
  • TORQUE SPECS: Do not overtighten bolts. Main plug (M19) 22 Nm, magnetic plug (M12) 15 Nm, oil filter cap 15 Nm.
  • CHECK LEVEL: Always check the inspection window after initial warm-up and topping off.
  • OIL SERVICE INTERVALS: Sherco recommends regular changes; some owners report changing between 65–100 hours based on use—more frequent changes maintain engine longevity.
  • ENVIRONMENT: Work in a clean area to avoid contamination. Take care not to overfill.

Proprietary Best Practices from MotoSport.com

  • Track every oil change in a logbook or maintenance app for warranty and resale.
  • Inspect the magnetic drain plug for excess metal—this is your “early warning system” for engine wear.
  • Top off the oil only after the bike’s sat for a few minutes post-riding to allow accurate level measurement.
  • Consider using high-end oil like Motorex or Motul, as recommended by many Sherco racers.
  • If unsure about torque values, err on slightly lower and recheck tightness after first ride.

Conclusion

Changing the oil on your 2021 Sherco 300 SEF FACTORY is a straightforward but essential maintenance task. Using the right tools, following each model-specific step, and paying close attention to orientation and torque specs will keep your machine in optimal running shape—and every change becomes easier, faster, and cleaner with experience.

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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.