How to Change the Oil in a 2018 Sherco 300 SE FACTORY

Shop parts for a 2018 Sherco 300 SE FACTORY Dirt Bike.

If you ride a 2018 Sherco 300 SE FACTORY, regular oil changes are essential to ensure engine longevity and smooth power delivery on the trail. This step-by-step guide is tailored specifically to this model, highlighting important call-outs for owners and the unique aspects of performing this maintenance on your dirt bike.

Tools & Supplies You’ll Need

  • 17mm socket (for drain plugs)
  • 8mm socket (for filter cap bolts, if necessary)
  • 4mm Allen head wrench (for other fasteners)
  • Drain pan
  • Replacement oil filter
  • New O-ring and gaskets (crush washers)
  • Funnel
  • Shop towels or paper towels
  • Torque wrench
  • Appropriate engine oil: SAE 10W60, total quantity 0.9 liters
  • Rubber gloves (optional, for cleanliness)

Preparation

  • Warm up the engine for a couple of minutes. Warm oil drains faster and carries away more contaminants.
  • Ensure the bike is upright with the engine OFF and cool enough to handle.
  • Place the bike on a stable stand, if available, and set your drain pan directly below the drain plugs on the bottom of the crankcase.

Step-by-Step Oil Change Instructions

  1. Remove the Drain Plugs
    The 2018 Sherco 300 SE FACTORY features two key drain plugs: the main drain plug (M19, torque to 22Nm) and a magnetic drain plug (M12, torque to 15Nm).
    • Using a 17mm socket, remove these plugs and let the oil drain completely.
    • Pay attention to the magnetic plug. Wipe off any metal debris to monitor wear inside your engine.
    • Replace the crush washers if they show any signs of damage or deformation to prevent leaks.
    Call-out:– The Sherco’s plug locations might be covered by the engine guard—remove it if necessary for full access.
    Environmental tip:– Collect used oil and dispose of it at a recycling center; never pour it down the drain or onto the ground.
  2. Pre-Filter and Oil Filter Removal
    • Locate the pre-filter and oil filter housing (typically on the right side of the crankcase).
    • Remove the oil filter cover using a 4mm Allen or 8mm socket (depending on your hardware).
    • Extract the old oil filter. Inspect the pre-filter and clean it if necessary.
    • Fit a new oil filter in the orientation shown in the manual and replace the O-ring on the filter cap to ensure a proper seal.
    Call-out:– The Sherco requires the oil filter be replaced at every oil change. The cap uses a new O-ring each time (tighten to 15Nm for the filter cap and magnetic plug).
  3. Reinstall Plugs and Oil Filter
    • Install the cleaned and/or new pre-filter and oil filter.
    • Apply a small amount of fresh oil to the new filter’s O-ring and the threads before reinstalling.
    • Reattach the filter cap and engine drain plugs with a torque wrench to manufacturer’s specs: Drain plug (M19) at 22Nm, filter cap (M45) at 15Nm, magnetic drain plug (M12) at 15Nm.
  4. Refill the Engine with Oil
    • Remove the oil fill cap. The fill port may be located just under the exhaust header–space can be tight, so use a small funnel and pour slowly to avoid spills.
    • Use high-quality 10W60 motorcycle-specific synthetic oil; Sherco recommends Motul or Motorex brands.
    • Pour in approximately 0.9L, but be cautious not to overfill.
    Call-out:– The 2018 model may have its fill port in a less-accessible spot beneath the titanium exhaust—patience and the right funnel make this task much easier.
  5. Check the Oil Level
    • With the bike upright and level, check the sight glass or dipstick (if equipped) to ensure oil is at the proper level indicator. Top off if needed.
    • Reinstall the fill cap securely.
    • Start the engine and let it idle for a minute, then turn it off and re-check the oil level. Add oil if necessary to compensate for filter absorption.
  6. Final Inspection
    • Look for any leaks at the drain plug, filter cap, or oil fill cap.
    • Reattach the engine guard if you removed it at the start.
    • Dispose of old oil and filter responsibly.

2018 Sherco 300 SE FACTORY Specific Tips and Notes

  • The recommended oil is SAE 10W60 with a capacity of 0.9 liters. Four-stroke motorcycle oil is recommended by Sherco; avoid automotive oils as they may not cater to motorcycle clutch requirements.
  • Change the oil filter every time you change the oil.
  • Replace drain plug crush washers as a best practice to prevent leaks.
  • Accessing the oil fill cap can be tricky due to its position beneath the exhaust on this model–use patience and the right funnel.
  • Check for any metal particles on the magnetic drain plug after draining oil–if you notice excessive shavings, investigate further for potential internal engine issues.
  • Sherco service intervals may suggest longer gaps between oil changes, but frequent changes (every 10–20 hours for aggressive riding or racing) are the best practice for engine health.

Conclusion

Changing the oil in your 2018 Sherco 300 SE FACTORY is straightforward but critical for keeping your dirt bike performing at its best. Following the above steps, using the correct oil and torque specs, and noting unique model-specific details will ensure a job well done. Always refer to your owner’s manual for more detailed diagrams and never compromise on oil or filter quality. Stay ahead on maintenance, and your Sherco will reward you with more trouble-free miles on every rip.

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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.