How to Change the Oil in a 2025 Sherco 300 SEF FACTORY

Shop parts for a 2025 Sherco 300 SEF FACTORY Dirt Bike.

Regular oil changes are crucial to maintaining your 2025 Sherco 300 SEF Factory’s performance and longevity. This detailed guide, proprietary to MotoSport.com, outlines all tools needed and walks you through every step. We also include specific tips for the 2025 model.

Tools & Materials Needed

  • 17mm socket (for drain plug)
  • 8mm socket (for oil filter cover bolts, if changing filter)
  • 4mm Allen (hex) key (for side covers if necessary)
  • Ratchet/spanner
  • Oil drain pan
  • Shop towels/rags
  • Funnel
  • New oil filter (recommended, Sherco OEM or equivalent)
  • Replacement crush washer (aluminum, highly recommended)
  • Engine oil: Motul 10W-50 (Sherco OEM recommended) or Motorex, approx. 1–1.2 liters
  • Gloves (optional, for cleanliness and safety)

Important 2025 Model Notes

  • Factory and Racing models share the same engine configuration and oil change procedure. Minor exhaust differences do not impact the oil task, but the titanium exhaust may partially obscure the fill port, making a flexible funnel helpful.
  • Do not overtighten drain bolts—aluminum threads can strip.
  • Inspect and clean the magnetic drain plug during every oil change for metal debris.
  • Change the crush washer every oil change to prevent leaks. Reusing once or twice is common, but replacing it is safest.
  • Change interval: Sherco recommends every 100 engine hours, but many owners change more frequently for maximum engine protection.

Step-by-Step: Changing the Oil

  1. Warm Up the Engine
    • Start your Sherco and let it idle for 2–3 minutes. This helps the oil flow out smoothly, removing more contaminants.
    • Shut off the engine and let it cool for a minute so it’s not too hot to touch.
  2. Locate the Drain Plugs and Oil Filter
    • The Sherco 300 SEF Factory has two drain bolts on the bottom of the crankcase. Both need to be removed to completely drain the oil.
    • Oil filter is under a cover on the crankcase side, held by 8mm bolts.
  3. Drain the Old Oil
    • Place your oil pan beneath both drain bolts.
    • Using a 17mm socket, loosen and remove both drain bolts. Allow oil to fully drain.
    • Remove and inspect the magnetic drain plug for metal particles—clean thoroughly with a rag.
    • Inspect and, if needed, replace the aluminum crush washers on the drain plugs.
  4. Replace or Clean the Oil Filter
    • Using the 8mm socket, remove the oil filter cover bolts and cover.
    • Pull out the old oil filter. Inspect for excess metal/debris.
    • Install a new Sherco OEM (or equivalent) oil filter. Ensure it’s seated correctly and oriented as per manual.
    • Replace the cover and tighten bolts to manufacturer torque spec (do not overtighten).
  5. Reinstall Drain Plugs
    • Ensure magnets are clean, new/clean crush washers are in place, and threads on plug and case are clean.
    • Hand-tighten each bolt, then tighten firmly (but not excessively). Recommended torque is typically 15–20 Nm but verify in your owner’s manual.
  6. Refill with Fresh Oil
    • Locate the oil fill port on the right side, above or behind the exhaust. It may be slightly hidden by the titanium pipe, so a flexible funnel helps.
    • Add up to 1.2 liters of Motul 10W-50 (or your preferred high-quality synthetic oil).
    • Replace the filler cap and wipe away any oil spills.
    • Double-check oil level with the sight glass or dipstick according to your owner’s manual.
  7. Check for Leaks and Final Steps
    • Start the engine and let it idle for a minute. Shut off and check around drain plugs and filter for leaks.
    • Wait a few minutes, then re-check the oil level. Top up if needed, but do not overfill.
    • Dispose of old oil and filter responsibly.

Model-Specific Call-outs

  • 2025 Sherco 300 SEF Factory:
    • The oil fill port is tucked under the exhaust—a flexible funnel or spout is highly recommended for clean filling.
    • Magnetic drain plugs must be cleaned at every change to check for early signs of engine wear.
    • Both drain plugs (not just one) must be removed for a full oil change—failure to do so risks leaving old, contaminated oil inside.
    • Sherco factory recommends Motul 10W-50 for best results, though Motorex or other quality full-synthetic oils are also suitable.
    • Replace the crush washers at every oil change, available from Sherco dealers or parts suppliers.

Conclusion

Following these detailed steps ensures your 2025 Sherco 300 SEF Factory receives the attention it deserves, maximizing its performance and reliability. Always use OEM parts when possible, change crush washers frequently, and keep the area clean to avoid contamination. For questions or to order supplies, visit MotoSport.com—your trusted source for Sherco maintenance products.

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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.