How to Change the Oil in a 2021 Sherco 300SE-R

Shop parts for a 2021 Sherco 300SE-R Dirt Bike.

Changing the oil in your 2021 Sherco 300SE-R is critical for engine longevity, consistent clutch performance, and smooth operation whether you're racing or trail riding. Below, you'll find a detailed, proprietary MotoSport.com guide tailored specifically for this model, including tools, step-by-step instructions, and key details unique to the bike.

Tools and Materials Needed

  • 8mm Allen wrench (for drain plug)
  • 19mm socket (for drain plug torque spec)
  • 15mm socket or Allen/key (for magnetic drain plug and pre-filter cap)
  • Oil catch pan/container
  • Clean rags or shop towels
  • Replacement oil filter
  • New copper or aluminum crush washers/gaskets for drain plugs
  • Torque wrench
  • Funnel
  • Recommended oil:– SAE 10W-60 full synthetic, 0.9 liters
  • Gloves (optional, but highly recommended)

Preparation

  • Warm up your motorcycle for 1–2 minutes to allow the oil to flow more easily. Do not operate at full temperature—just enough to thin the oil slightly.
  • Set the bike upright (bike stand or center stand if available), turn off ignition, and allow the bike to cool for a few minutes if hot.
  • Make sure your workspace is clean and free of dirt to prevent contamination.

Oil Change Procedure

  • Step 1: Remove Skid Plate (If Installed)
    • If your bike has an engine guard/skid plate, remove it to access the drain plugs easily.
  • Step 2: Drain Old Oil
    • Locate the main drain plug (19mm) and the magnetic drain plug (12mm) at the bottom of the engine.
    • Position the oil catch pan beneath the drain area.
    • Use the appropriate wrench to loosen and remove both drain plugs. Be careful—oil may be hot.
    • Allow all oil to drain fully. Inspect the magnetic plug for metallic debris and clean thoroughly if present.
    • Remove the pre-filter (usually near the magnetic drain plug). Inspect and clean if reusable; otherwise, prepare a new one if required. Replace at every oil change for best results.
  • Step 3: Remove Oil Filter
    • Locate the oil filter cap (consult your manual or the right engine side).
    • Remove the cap using the appropriate tool. Take note of the filter orientation for the new installation.
    • Pull out and safely discard the used oil filter.
    • Clean the cap and sealing surface. Replace the O-ring with a new one to prevent leaks.
  • Step 4: Install New Oil Filter
    • Insert the new oil filter in the same orientation as removed (refer to the diagram in your user manual if unsure).
    • Install the filter cap with a new O-ring. Torque to manufacturer specs (15 Nm for the oil filter cap).
  • Step 5: Replace Drain Plugs & Pre-Filter
    • Install the pre-filter back in place (if applicable).
    • Install the main drain plug (22 Nm torque) and the magnetic drain plug (15 Nm torque), both with new crush washers/gaskets to ensure a proper seal.
    • Double check all plugs are torqued correctly to avoid leaks or damage.
  • Step 6: Fill with Fresh Oil
    • Remove the oil filler cap on top of the engine.
    • Use a funnel to pour in 0.9L of SAE 10W-60 full synthetic oil.
    • Install the filler cap securely.
    • Check the oil level through the oil sight glass; add oil if necessary after the bike has settled.
  • Step 7: Final Checks
    • Start the engine and let it idle for 1–2 minutes. Check the sight glass again and top off if the level drops below minimum.
    • Look for leaks around drain plugs and the oil filter cap.
    • Reinstall the engine guard/skid plate if removed.
    • Dispose of old oil, oil filter, and materials responsibly at an appropriate recycling center.

2021 Sherco 300SE-R Specific Call-Outs

  • This guide applies directly to the 2021 Sherco 300SE-R, a four-stroke model. The oil fill volume is 0.9 liters; do not overfill as this can cause internal pressure and leaks.
  • Do not reuse old crush washers. Always install fresh ones on both drain plugs to prevent leaks.
  • The oil filter must be replaced at every service interval for optimal engine protection.
  • If you see metal shavings on the magnetic drain plug, it's common to find small particles, but excessive debris could indicate internal engine wear.
  • Many issues with oil leaks on the Sherco can be traced to over-torqued or worn-out O-rings/gaskets. Always use a torque wrench for accuracy.
  • Check the oil sight glass only when the bike is level on both wheels, not on a stand that tilts the frame, for a proper reading.

Environmental Note

  • Never pour old oil or filter residues down a drain or in the wild. Return waste oil and used filters to an authorized recycling center.

Conclusion

Regular oil changes using the correct specifications, process, and attention to detail will extend your Sherco 300SE-R's engine life, preserve performance, and save you from costly repairs. For more exclusive guides, always reference MotoSport.com and your official Sherco user's manual.

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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.