How to Change the Oil in a 2018 Sherco 450 SEF FACTORY

Shop parts for a 2018 Sherco 450 SEF FACTORY Dirt Bike.

Changing the oil in your 2018 Sherco 450 SEF Factory is an essential maintenance task that keeps your engine running smoothly and ensures proper lubrication of critical components. Below, you’ll find a comprehensive, step-by-step guide specifically tailored for this model, including required tools, procedure, and exclusive tips every owner should know.

Tools & Supplies You’ll Need

  • 17mm socket (for drain plug)
  • 8mm socket (for filter cover bolts)
  • 4mm Allen wrench (for select bolts if present)
  • Torque wrench (for precise reassembly)
  • Oil collection pan
  • New engine oil (check your owner’s manual for correct viscosity and capacity–typically 10W-50 Four-Stroke Motorcycle Oil)
  • New oil filter (specific for 450 SEF models)
  • Replacement oil drain plug crush washer (recommended for leak prevention)
  • Gloves and rags for cleanup
  • Funnel (for tidy refills)
  • Brake cleaner or non-residue degreaser (for cleaning screens and bolts)

Preparation

  • Warm up the bike for a few minutes to get the oil flowing. Stop the engine and let it cool briefly–oil should be warm, not hot, to ensure safety and optimal draining.
  • Place the bike upright on a stable stand with plenty of space around beneath the engine.
  • Gather all your tools and prep your replacement parts for quick access.

Procedure: Step-By-Step Oil Change

  • Locate the Oil Drain Plug
    • The drain plug for the 2018 Sherco 450 SEF Factory is found on the bottom of the engine. It uses a 17mm socket to remove and may be magnetic–watch for metal debris.
  • Remove the Oil Drain Plug
    • Carefully loosen the drain plug and allow all oil to drain into your oil pan. Remove and inspect the crush washer; replace it if deformed for proper sealing.
  • Remove Oil Screens
    • This model features oil screens accessible by removing additional bolts (usually with 8mm socket or 4mm Allen). Take care when unscrewing these–some have O-rings.
    • Remove the screens and clean them thoroughly with brake cleaner. If excessive metal shavings are found, note and monitor at your next change.
  • Remove Oil Filter
    • Locate the oil filter cover (typically secured with 8mm bolts). Remove the cover, then remove the old oil filter. Inspect the O-ring on the cover and replace it if cracked or flattened.
  • Install New Oil Filter
    • Insert the new oil filter in the correct orientation (check for ‘OUT’ or ‘IN’ markings). Lubricate the filter with a little fresh oil before installation. Reinstall the cover and tighten bolts to the torque spec in your manual (usually 8–10 Nm).
  • Reinstall Oil Screens and Drain Plug
    • Double-check screens for cleanliness. Install the screens and replace O-rings if necessary. Install the drain plug with the new crush washer and torque to specification (refer to your manual, generally 10–15 Nm for the plug).
  • Refill with Fresh Oil
    • Using a funnel, add the factory-recommended amount and grade of oil (commonly around 1.3–1.5 L, but consult your manual). Pour slowly to avoid overfilling.
    • Reinstall the oil fill cap.
  • Start and Check
    • Start the bike and let it idle for a minute, then switch off and wait a few minutes for oil to settle. Check the oil sight glass or dipstick for level. Top up if needed.
    • Visually inspect for leaks around the drain plug and filter cover.
  • Dispose of Old Oil Responsibly
    • Take used oil and the filter to an approved recycling center.

Special Notes and Sherco 450 SEF Factory Owner Call-outs

  • Crush washers should always be replaced with each oil change to prevent oil seepage. Skipping this can lead to slow leaks and possible engine damage.
  • This model features BOTH a magnetic drain bolt and oil screens. Both must be cleaned at each oil change to avoid debris recirculation. The magnetic drain bolt catches metal flakes–a build-up suggests abnormal wear and should be monitored closely.
  • Some bolts securing oil screens have O-rings–always check for damage and replace as needed for leak-free operation.
  • Be careful not to overtighten the drain plug or filter cover bolts; the Sherco’s aluminum threads are easy to strip. Use a torque wrench and refer to your manual for the correct specs.
  • If the oil filter cover O-ring is hard or cracked, replace it to prevent oil leaks under pressure.
  • If you notice persistent engine oil contamination or high metal content, consider checking the gearbox and clutch for abnormal wear or consult a professional, as this could signal a deeper mechanical issue.
  • Always use oils meeting the Sherco’s specified JASO MA or MA2 standards–automotive oils with friction modifiers are not suitable for your wet clutch system.

Conclusion

By following these steps, you’ll keep your 2018 Sherco 450 SEF Factory in top running condition and extend the life of its high-performance engine. Regular oil changes–at least every 10–15 hours or after heavy use–are the single best way to ensure reliability and maximum ride enjoyment.

Exclusive to MotoSport.com: Get all your Sherco-specific oils, filters, and maintenance kits from our one-stop platform, with expert advice tailored for your bike.

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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.