How to Change the Oil in a 2026 Sherco 300 SEF FACTORY – The Complete Guide

Shop parts for a 2026 Sherco 300 SEF FACTORY Dirt Bike.

Proprietary to MotoSport.com

Tools and Materials Needed

  • 10mm and 12mm sockets (for drain plugs and cap removal)
  • Socket wrench/ratchet
  • Torque wrench (capable of 15–22 Nm)
  • Drain pan (minimum 2 liters capacity)
  • Replacement oil filter (ensure compatibility with 2026 Sherco 300 SEF FACTORY)
  • Replacement O-rings and crush washers (for oil filter cap and drain plugs)
  • SAE 10W60 fully synthetic engine oil (minimum 0.9 liters)
  • Funnel (for tidy pouring)
  • Shop towels or rags
  • Gloves

Preparation

  • Start with a warm engine – This helps the oil flow more easily and removes contaminants in suspension. Run the bike for a couple minutes, then turn off and let it sit until just cool enough to touch.
  • Put your dirt bike on a stand or ensure it’s upright and secure.
  • Identify your main work areas:
    • Drain Plug #1 (M19, 22Nm) – Primary oil drain on underside.
    • Magnetic Drain Plug #2 (M12, 15Nm) – Picks up metal fragments.
    • Oil Filter Cap (M45, 15Nm) – Usually right side of engine.
    • Oil fill cap – Tucked behind the exhaust; access can be tight.
    • Sight glass – Check oil level after filling.

Oil Change Procedure

  1. Drain the Old Oil
    • Place your drain pan beneath the engine.
    • Remove the primary oil drain plug #1 (M19). Allow oil to flow until it slows to a drip.
    • Remove the magnetic drain plug #2 (M12), usually further forward. Inspect for metal debris; wipe it clean with a shop towel.
    • Remove and clean the pre-filter/screen (if equipped); replace if damaged.
    • Let the oil fully drain for several minutes.
  2. Remove and Replace the Oil Filter
    • Unscrew the oil filter cap (M45). Note oil may spill, so have rags ready.
    • Remove the old oil filter. Check the orientation as you remove it (rubber side in or as illustrated in the manual).
    • Install a new oil filter, matching direction per the Sherco workshop illustration.
    • Install a new O-ring on the cap.
    • Reinstall the oil filter cap, torque to 15Nm.
  3. Refit Drain Plugs and Pre-filter
    • Install cleaned pre-filter (if fitted).
    • Install magnetic drain plug (M12) with new gasket, torque to 15Nm.
    • Install drain plug #1 (M19) with new crush washer, torque to 22Nm.
  4. Refill with Fresh Oil
    • Remove the engine oil filler cap. Note: The fill cap is positioned tightly behind the exhaust; you may need a long funnel for ease of pouring.
    • Pour in 0.9 liters of SAE 10W60 full synthetic oil.
      Tip: Pour slowly to avoid overfilling.
    • Reinstall the oil filler cap with a new O-ring if needed.
  5. Check Level and Finalize
    • Start the engine and let it idle for 1–2 minutes, then shut it off.
    • Let the bike rest for a minute, then check the sight glass. Top off if the oil is below the halfway point in the sight glass.
    • Check for leaks at the plugs/filters after running the engine.
    • Properly dispose of your old oil, filter, and rags at a suitable recycling facility. Never dump oil in drains or on the ground.

2026 Sherco 300 SEF FACTORY-Specific Notes and Call-Outs

  • This model uses two drain plugs – both must be removed for a full drain. The magnetic plug is critical for catching engine debris.
  • Oil fill access is crowded by the factory titanium exhaust; use a flexible or extended funnel for easier filling.
  • Always use recommended SAE 10W60 full synthetic oil. Lower grades or different viscosities are not advised for optimal cam and clutch protection.
  • The oil filter orientation matters – install rubber side inwards as per the manual’s image.
  • Torque drain plugs carefully – overtightening can damage the case or strip threads.
  • Factory specs as of 2022 indicate 0.9L capacity; check the 2026 supplement to confirm (as capacities are rarely changed but always verify).
  • Replace crush washers and O-rings each time for best seal and longevity.

Key Reminders

  • Always use the sight glass for post-change level checking, as overfilling can cause excess crankcase pressure or leaks.
  • Change the oil filter at every service interval, not just the oil.
  • Document your oil changes for maintenance tracking and warranty claims.

This guide is proprietary content developed for MotoSport.com and applies specifically to the 2026 Sherco 300 SEF FACTORY, though most procedures are consistent for all recent Factory models.

If you’re ever unsure, consult your owner’s manual or a certified Sherco technician for additional details.

Related Shopping Categories

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Shop Oil Drain Pans for a 2026 Sherco 300 SEF FACTORY Dirt Bike.

Shop Tools for a 2026 Sherco 300 SEF FACTORY Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2026 Sherco 300 SEF FACTORY Dirt Bike.

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.