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

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

Changing the oil in your 2018 Sherco 300SE-R is essential to ensure optimal performance and longevity of your engine. This guide, proprietary to MotoSport.com, provides full instructions, the tools required, and key notes specific to your make and model. Follow each step carefully for the best results.

Tools and Supplies Needed

  • 17mm socket (for drain plug)
  • 8mm socket (for oil filter cover bolts)
  • 4mm Allen key (if required, for other covers)
  • Drain pan
  • Shop rags or paper towels
  • New oil filter (replace each oil change)
  • New O-ring for oil filter cap
  • New copper/aluminum washer for drain plug
  • SAE 10W60 engine oil (factory spec, 0.9 liters total fill)
  • Torque wrench
  • Parts cleaner (brake cleaner or similar for cleaning pre-screens and magnetic plug)
  • Disposable gloves (optional, for cleanliness)

Preparation

  • Start the engine and let it idle for 2–3 minutes to warm up the oil. This ensures better oil flow and more effective drainage.
  • Turn off the engine and place the bike on a stable stand.
  • Make sure you’re working in a clean area to prevent dirt from contaminating open engine parts.

Step-by-Step Oil Change Process

  1. Remove the Engine Guard:
    • Take off the engine skid plate if equipped, to access the lower drain bolts.
  2. Drain the Old Oil:
    • Place your drain pan beneath the engine’s drain plugs.
    • There are two main drain plugs:
      • Primary drain plug (M19, 22Nm torque): This is the main oil drain bolt.
      • Magnetic drain plug (M12, 15Nm torque): This collects metallic debris. Remove both to fully drain oil.
    • Remove both plugs and allow all oil to drain thoroughly. Be careful—hot oil can burn.
    • Remove the engine oil filler cap (top of the engine) to allow better flow.
  3. Clean and Inspect Parts:
    • Remove and clean the pre-filter (a mesh screen) and magnetic drain plug. Inspect for excessive metallic debris (a small amount is normal).
    • Replace the drain plug washers with new ones to ensure a good seal and prevent leaks after reassembly.
    • Clean the area around the plugs before installation.
  4. Replace the Oil Filter:
    • The oil filter—replace at every oil change—is located on the left side of the engine underneath a small round cover with several bolts (typically secured with 8mm bolts).
    • Remove the cover; note the orientation and position of the filter for correct installation.
    • Clean the filter area and install a new O-ring on the filter cap if supplied.
    • Insert the new filter in the correct direction as shown in your manual. Refit the cap and tighten bolts evenly to avoid leaks, using 15Nm torque as specified for the cap.
  5. Reinstall Plugs and Pre-Filters:
    • Reinstall the pre-filters and drain plugs in the correct positions. Refer to your manual or photos for guidance.
    • Tighten the main drain plug to 22Nm and the magnetic drain plug to 15Nm using your torque wrench.
  6. Refill the Engine Oil:
    • With the filter and plugs back in place, slowly pour 0.9L of SAE 10W60 oil into the filler opening.
    • Refit the filler cap.
  7. Final Checks:
    • Start the engine and let it run at idle for one minute. Turn it off and let the oil settle for a few minutes.
    • Check the oil level through the sight glass with the bike upright (not on a side stand). Add oil if necessary to reach the correct mark.
    • Inspect for leaks around the drain plugs and oil filter cover.
    • Reinstall skid plate/engine guard if equipped.
    • Dispose of old oil and filters responsibly: take to a designated recycling center, never pour down drains or into the environment.

Specific Call-Outs for the 2018 Sherco 300SE-R

  • Factory oil specification is 0.9 liters of SAE 10W60. Using a different oil grade or incorrect amount can affect engine life.
  • First oil change is recommended after 5 hours of operation, then follow regular service intervals as stated in your owner’s manual.
  • Always replace the oil filter and O-rings with every oil change for optimal reliability.
  • There are two separate drain plugs plus a pre-filter to remove, which is critical for proper oil drainage and filtration. Do not skip cleaning these components.
  • Do not overtighten bolts—use a torque wrench at specified settings (Drain plug: 22Nm, Magnetic plug: 15Nm, Filter cap: 15Nm) to avoid stripping threads or causing leaks.
  • Always check for leaks after installation and confirm the oil level with the engine warm and upright.

Conclusion

Changing the oil on your 2018 Sherco 300SE-R will prolong engine life and maximize performance. Use the right oil and filters, follow torque specs, and maintain a clean work environment. If unsure about any procedure, consult your authorized Sherco dealer or a certified mechanic.

This maintenance guide is proprietary to MotoSport.com and designed specifically for the 2018 Sherco 300SE-R.

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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.