How to Change the Oil in a 2019 Sherco 300SEF-R

Shop parts for a 2019 Sherco 300SEF-R Dirt Bike.

Changing the oil in your 2019 Sherco 300SEF-R is vital for engine health and performance. This step-by-step guide, proprietary to MotoSport.com, details every aspect of the job—tools needed, model-specific callouts, and best practices to ensure your dirt bike runs at its best.

Tools and Materials Needed

  • 17mm socket (for drain plug)
  • 8mm socket (for fasteners/oil filter cover if needed)
  • 4mm Allen wrench (for filter cap)
  • Drain pan
  • New oil filter (check for compatibility—OEM or K&N recommended)
  • Replacement O-ring (for oil filter cover)
  • New crush washers (recommended for each drain bolt)
  • Clean lint-free rags or shop towels
  • Torque wrench (for proper tightening)
  • Funnel
  • SAE 10W60 engine oil–0.9 liters (approx.)
  • Nitrile gloves (optional, but keeps hands clean)

Steps to Change the Oil

  • Warm Up the Engine
    • Start and run the bike for 2-3 minutes. Warm oil drains more efficiently.
  • Stabilize and Prep the Bike
    • Secure the bike upright using a stand on a level surface. Remove the skid plate or engine guard, if fitted.
  • Drain the Old Oil
    • Locate the two drain plugs underneath—one standard, one magnetic. Both should be unscrewed (use the 17mm socket).
    • Position the drain pan to catch the oil from both bolts. Let oil drain completely.
    • Remove the engine oil filler cap located near the titanium exhaust (placement can be tight due to exhaust routing) to ensure smooth drainage.
  • Remove and Inspect Oil Filter
    • Use your 8mm socket or 4mm Allen wrench to take off the oil filter cover. Remove the oil filter, noting its orientation. Replace with a new filter each oil change.
    • Inspect the O-ring on the filter cover and replace if it's pinched, worn or brittle.
  • Inspect and Clean Components
    • Wipe both drain plugs (especially the magnetic plug) to remove old oil and any metal shavings, as this captures engine wear particles.
    • Inspect both plugs’ crush washers; replace them if damaged for a proper seal and to prevent leaks. Many riders replace these annually or with every change for peace of mind.
  • Reinstall Drain Plugs and Oil Filter
    • Refit the pre-filter, oil filter (in correct orientation), and filter cover using a new O-ring. Torque the oil filter cover cap to 15 Nm.
    • Install both drain plugs: the magnetic plug (M12) should be torqued to 15 Nm, and the primary drain plug (M19) to 22 Nm.
  • Refill with New Oil
    • Pour in 0.9 liters of SAE 10W60 oil via the oil filler opening–be patient, as fill area is tight with the exhaust nearby.
    • Watch the oil level in the sight glass (usually on the engine side cover) and stop pouring when the correct level is reached.
  • Check for Leaks and Reassemble
    • Double-check all bolts and the oil filter cover for leaks, wipe off any spills, and reinstall the skid plate/guard if applicable.
  • Start and Re-Check Oil Level
    • Start the engine, let it idle for a minute, and shut it off. Wait a few moments and re-check the sight glass. Top up if necessary.
  • Dispose of Used Oil and Filter Properly
    • Take used oil, old filter, and any soiled rags to a local recycling center. Never dispose of oil in drains or on the ground.

2019 Sherco 300SEF-R Model-Specific Callouts

  • Tight Filler Port Placement: The oil fill is located close to the exhaust header, making access somewhat awkward. Use a funnel with a narrow neck for refilling. Take care to avoid burns from a hot exhaust, and ensure the bike is stable before proceeding.
  • Drain Plug Torque: The M19 drain plug must be torqued to 22 Nm, and the magnetic M12 plug to 15 Nm. Overtightening can strip the aluminum threads, so always use a torque wrench.
  • Crush Washer Replacement: While some riders re-use crush washers for several cycles, the safest practice is to replace them with every oil change to ensure leak-free seals.
  • Oil Filter Orientation: Install the new oil filter in the direction shown in your user manual or as per OEM instructions—incorrect installation can restrict oil flow and cause engine damage.
  • Filter Change Interval: The oil filter should be changed every time you change the oil.

Final Tips

  • Record your oil change with engine hours and date for future reference.
  • Always use the recommended SAE 10W60 grade synthetic oil for best protection, especially under performance riding conditions.
  • Operate the bike a short while and check oil again to confirm the correct fill level and absence of leaks.

Routine oil changes are the most important maintenance task for your Sherco 300SEF-R. Following the steps and model-specific notes above ensures optimal performance and a longer-lasting engine.

This guide is proprietary to MotoSport.com and designed specifically for the 2019 Sherco 300SEF-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.