How to Change the Oil in a 2018 Sherco 450 SEF-R: Step-by-Step Guide

Shop parts for a 2018 Sherco 450 SEF-R Dirt Bike.

Routine oil changes are essential for the longevity and performance of your 2018 Sherco 450 SEF-R. Follow this comprehensive oil change guide, proprietary to MotoSport.com, to keep your bike running strong. This guide includes tools needed, a step-by-step process, and model-specific tips for the 450 SEF-R.

Tools & Materials Needed

  • 17mm socket (for drain plug)
  • 8mm socket (for oil filter cover bolts)
  • 4mm Allen wrench (if required on secondary drains)
  • Torque wrench (for precise reassembly)
  • New oil filter (replace every oil change)
  • New drain plug crush washer
  • 0.9L of SAE 10W60 4-stroke motorcycle engine oil
  • Drain pan
  • Shop rags/paper towels
  • Funnel
  • Gloves

Step 1: Prepare the Motorcycle

  • Start the bike and let it idle for 2–3 minutes. This warms the oil for better drainage.
  • Place the bike on a level stand or lift.
  • Turn off the engine and allow it to cool slightly.

Step 2: Drain the Old Oil

  • Place a drain pan underneath the skid plate, directly under the engine.
  • Remove the main drain plug (M19, 22Nm) using a 17mm socket.
  • Remove the magnetic drain plug (M12, 15Nm) with the correct socket.
  • On Sherco 4T SEF models, there may be a pre-filter screen plug; remove with the specified tool if equipped.
  • Let all the oil and possible debris drain completely.

Step 3: Remove and Replace the Oil Filter

  • Locate the oil filter cover on the right side of the engine.
  • Use an 8mm socket to remove the three (or more) bolts securing the cover.
  • Gently remove the cover and old oil filter. Note the orientation for proper reassembly (the open end of the filter faces out).
  • Replace the old oil filter with a new one.
  • Inspect and replace the O-ring on the filter cover if damaged or worn.
  • Wipe the filter cover clean and reinstall it, tightening the bolts evenly and to spec (15Nm).

Step 4: Clean and Inspect Components

  • Inspect the magnetic drain plug for metal debris and clean thoroughly.
  • Replace crush washers on all drain plugs with new ones.
  • Clean the pre-filter screen, if your model is equipped, and reinstall it carefully.

Step 5: Reinstall and Torque the Drain Plugs

  • Reinstall drain plugs and pre-filter (if applicable) with new gaskets or crush washers.
  • Tighten the main drain plug (M19) to 22Nm.
  • Tighten the magnetic drain plug (M12) to 15Nm.

Step 6: Refill With Fresh Oil

  • Locate the oil filler cap on the right engine cover and remove it.
  • Using a funnel, fill the engine with 0.9 liters of SAE 10W60 4-stroke oil as specified for the 450 SEF-R.
  • Reinstall the filler cap securely.

Step 7: Check Oil Level and for Leaks

  • Start the engine and let it idle for 1–2 minutes.
  • Shut off the engine and let it stand for a minute to allow oil to settle.
  • Check the oil level using the sight glass on the engine; top up if needed.
  • Inspect all drain plug and filter areas for leaks and wipe clean.

Important 2018 Sherco 450 SEF-R Specific Callouts

  • Dual drain plugs (main and magnetic) must both be removed and replaced—don't overlook either one as both help with debris removal and proper draining.
  • The oil filter must be installed in the correct direction per the Sherco photo diagram (open face out).
  • Always use new crush washers to prevent leaks.
  • Factory torque settings are critical: main drain plug (M19) = 22Nm, magnetic drain plug (M12) and oil filter cover = 15Nm.
  • Oil capacity is 0.9L; do not overfill.
  • Replace the oil filter with every oil change, and dispose of oil responsibly at a collection center—never in the wild.
  • Ride the bike for a brief period after the oil change and check for any leaks, particularly around the drain plugs and oil filter cover.

Environmental & Maintenance Tips

  • Dispose of used oil and filters at approved recycling centers.
  • Log your oil change in your maintenance record for future reference.
  • For hard/muddy riding, consider changing your oil more frequently than the service interval.
  • Consult your owner's or workshop manual for detailed schematics of the oil system and additional procedures for your riding style or conditions.

With these steps and tips tailored for your 2018 Sherco 450 SEF-R, your oil change routine will be fast, clean, and help maximize your dirt bike's lifespan and performance. For genuine parts, tools, and expert advice, trust MotoSport.com.

Related Shopping Categories

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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.