How to Change the Oil in a 2018 Sherco 300SEF-R

Shop parts for a 2018 Sherco 300SEF-R Dirt Bike.

Changing the engine oil in your 2018 Sherco 300SEF-R is a crucial maintenance task that ensures peak performance and longevity of your dirt bike. This step-by-step guide, proprietary to MotoSport.com, walks you through the process, highlighting special model-specific tips to keep your machine running smoothly.

Tools and Materials Needed

  • 10mm socket wrench
  • 19mm, 12mm, 45mm sockets or wrenches
  • Drain pan or container (to catch old oil)
  • Torque wrench
  • New oil filter
  • Replacement O-rings and gaskets (for filter cap, drain plugs)
  • Engine oil – SAE 10W60, 0.9 liters
  • Degreaser/cleaning rags
  • Funnel
  • Gloves and eye protection

Instructions

  1. Warm Up the Engine
    Start the bike and let it idle for a few minutes to warm the oil. Warm oil drains more easily and removes more contaminants with it.
  2. Prepare the Bike
    Put the bike on a stable stand. Remove any skid plate for easier access if installed.
  3. Catch Old Oil
    Place a drain pan under the engine's bottom. Be sure this is positioned to catch all exiting oil.
  4. Remove Drain Plugs
    Locate and remove drain plug 1 (19mm, torque to 22Nm on reinstallation) and the magnetic drain plug 2 (12mm, torque to 15Nm on reinstallation). Allow all oil to drain out.
    For extra thoroughness, also remove and clean the pre-filter(s). These sit near the drain plugs and catch debris.
    Tip: Use a fresh gasket/O-ring on each plug to avoid leaks.
  5. Remove and Inspect the Oil Filter
    Unscrew the oil filter cap (45mm, torque to 15Nm when reinstalled). Pull out the oil filter with a hook or needle-nose pliers.
    Always use a new oil filter at each change for this model.
  6. Clean All Components
    Using degreaser, clean the drain plugs, filter cap, and pre-filters. Inspect these for wear or damage and replace if needed.
    The magnetic drain plug should be free of any large metallic debris – a little is normal, but excess metal could indicate a problem.
  7. Install New Filter and Refit Parts
    Install the new oil filter in the correct orientation (consult your owner–s manual for visual reference), ensuring the O-ring seats properly. Fit the filter cap with a new O-ring and tighten securely.
    Reinstall the cleaned pre-filters and both drain plugs with new washers/gaskets, torquing to spec:
    • Drain plug 1: 22Nm
    • Magnetic drain plug: 15Nm
    • Oil filter cap: 15Nm
  8. Refill with New Oil
    Unscrew the engine oil filler cap and use a funnel to pour in 0.9L of SAE 10W60 oil.
    Wait a few minutes, then check the sight glass or dipstick to confirm the oil is at the correct level.
    • Add oil as needed, being careful not to overfill.
  9. Check for Leaks and Finalize
    Start the engine briefly and inspect all seals and plugs for leaks.
    Shut off the engine, allow oil to settle, and recheck the oil level, topping up if needed.
  10. Dispose of Oil Responsibly
    Bring used oil, filter, and materials to a recycling or hazardous waste facility. Never pour oil down a drain or onto the ground.
  11. Reinstall Skid Plate (if equipped)

Model-Specific Callouts for the 2018 Sherco 300SEF-R

  • This model requires a new oil filter at every oil change—do not reuse the old one.
  • Torque specs are critical—Over-tightening drain plugs can strip threads in the crankcase.
  • The oil level is checked through the sight glass located on the right side of the engine. Ensure the bike is upright and on level ground when checking.
  • Oil capacity is 0.9 liters. Overfilling may cause excessive crankcase pressure and leaks.
  • Inspect the magnetic drain plug for metal shavings each service. Small particles are normal, but chunks or heavy accumulation may indicate internal engine issues.
  • Always install new O-rings or gaskets on the drain plugs and filter cap to prevent leaks.

Conclusion

Performing regular oil changes on your 2018 Sherco 300SEF-R is straightforward but requires attention to detail, correct torque specs, and careful cleanup and disposal. Keeping up with this maintenance will ensure reliable rides and maximize engine lifespan.

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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.