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

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

Changing the oil in your 2018 Sherco 300 SEF FACTORY is a key maintenance task essential for peak performance and long engine life. Below is a comprehensive, step-by-step guide proprietary to MotoSport.com, detailing what you need, how to do it, and specific call-outs for your bike.

Tools & Supplies Needed

  • Socket wrench set (for drain plugs and oil filter cap)
  • Oil drain pan
  • New oil filter (replace every oil change)
  • New pre-filter screens (replace if necessary)
  • New O-rings and crush washers (for drain plugs and filter cap)
  • Funnel
  • Rags and degreaser (for cleanup)
  • Torque wrench
  • SAE 10W60 oil: 0.9L (0.95 qt)

Steps to Change the Oil

  • Warm up the engine for a few minutes to ensure the oil flows easily. Then turn the bike off and put it securely on a stand.
  • Place the oil drain pan under the engine, aligned with both the main drain plug and the magnetic drain plug.
  • Use your socket wrench to remove the main oil drain plug (M19, 22Nm) and magnetic drain plug (M12, 15Nm). Allow the oil to fully drain.
  • Locate and remove the pre-filter screens (on the cases near the drain plugs). Inspect and clean with degreaser, or replace if damaged or excessively dirty.
  • With the oil pan still in place, remove the oil filter cover (M45, 15Nm) using a socket. Carefully extract the used oil filter with a hook or pliers. Match a new oil filter to the used one, making sure you install it facing the same direction as specified by Sherco documentation.
  • Always install new O-rings and crush washers on all plugs and filter caps to prevent leaks. Lightly oil the new filter–O-ring before installing.
  • Reinstall the oil filter cover and torque to 15Nm. Refit and torque the magnetic drain plug to 15Nm, and the main drain plug to 22Nm. Reinstall pre-filter screens and their caps as shown in official diagrams.
  • Double-check all parts are properly tightened to the manufacturer–torque specs.
  • Remove the engine oil filler cap. Insert a funnel and pour in 0.9L of SAE 10W60 oil, checking with the sight glass as you go. The oil level should be between the marks when the bike is upright on level ground.
  • Reinstall the filler cap and wipe away any spills.
  • Start the engine and let it idle for a minute, then turn off and wait a minute for oil to settle. Check the oil level again and top off if necessary.
  • Dispose of used oil, oil filter, and dirty rags properly. Never dump oil down a drain or in the environment.

Specific Sherco 300 SEF FACTORY Call-Outs

  • Oil filter orientation matters: Always install the new oil filter with the same direction as the one removed. A reversed filter can compromise engine lubrication.
  • Replace all gaskets/O-rings: All rubber seals, crush washers, and O-rings on filter caps and drains should be replaced at every oil change to prevent leaks and ensure correct sealing.
  • Pre-filter screens: Clean or replace the pre-filters each time, especially after muddy or dusty rides, as blocked pre-filters will lead to engine damage over time.
  • Tightening torques: Sherco specifies unique torque values for each plug and filter cover. Do not overtighten—this can strip threads or crush gaskets, leading to leaks.
  • Oil types: Sherco recommends only SAE 10W60 oil for the 2018 300 SEF. Other grades may not provide adequate protection. Do not use automotive oil.
  • Factory manual diagrams: Refer to official schematics for exact pre-filter and plug locations.

Disposal of Oil and Filters

  • Take used oil and filters to a certified recycling center. Do not dispose of oil in the trash, on the ground, or down any drains, as it can contaminate water supplies and harm wildlife.

Final Tips

  • If after filling the oil and running the bike, the oil appears milky, do not ride. This could indicate coolant contamination.
  • Check for any leaks around the plugs and filter after your first ride. Retorque if necessary.
  • Record the oil change in your maintenance log for warranty and resale purposes.

MotoSport.com team recommends performing your first oil change after the initial break-in period and then after every 10–15 hours of operation or as specified in your Sherco manual.

Related Shopping Categories

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Shop Tools for a 2018 Sherco 300 SEF FACTORY Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2018 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.