How to Change the Oil in a 2018 Husqvarna FS 450

Shop parts for a 2018 Husqvarna FS 450 Dirt Bike.

Keeping the oil fresh in your 2018 Husqvarna FS 450 is one of the most important maintenance tasks to ensure peak engine performance and long-term reliability. This guide, proprietary to MotoSport.com, covers everything you need to safely and thoroughly perform an oil change on this specific year, make, and model, including the tools required, step-by-step instructions, and key model-specific tips.

Tools and Supplies You’ll Need

  • Metric socket set (refer to your owner's manual for specific sizes, but typically 8mm and 13mm are needed)
  • Torque wrench
  • Drain pan to catch used oil
  • Clean rags or paper towels
  • Rubber gloves for cleaner hands
  • Oil filter (OEM or high-quality aftermarket replacement)
  • New engine oil (Capacity is 1.27 quarts/1.2 liters; Motul 7100 4T 10W-50 is a popular choice for Husqvarna 450s)
  • Replacement O-rings for drain and screen plugs (recommended by the service manual for each change)
  • Funnel
  • Skid plate removal tool (if you have an aftermarket or OEM guard fitted)

Preparatory Steps

  • Warm up the engine for 2-3 minutes. This thins the oil, helping it drain more completely and carry debris out with it.
  • Park the FS 450 on a stable, level surface and switch off the engine. Wait 1-2 minutes for the oil to settle in the sump.
  • If installed, remove the skid plate for better access to the drain plug and oil screens.
  • Place your drain pan directly under the engine.

Changing the Oil: Step-by-Step

  1. Remove Drain Plug and Oil Screens
    • Locate and remove the main drain plug (bottom of the engine), as well as the plug with the magnetic tip (captures metallic debris).
    • Remove both oil screens (one short and one long) from their respective ports. Refer to your manual or fiche for their exact location; typically, one is near the lower frame and the other is along the right side casing.
    • Be cautious, as the oil may be hot. Allow all oil to fully drain into the pan.
  2. Clean and Inspect Components
    • Carefully clean all removed plugs, screens, and sealing surfaces. Check O-rings and replace if hardened or damaged; the owner’s manual recommends new O-rings each change for best sealing and protection.
    • Inspect the magnetic plug for excessive metal particles, which could indicate abnormal wear.
  3. Replace the Oil Filter
    • Remove the oil filter cover (typically on the right side). Draw out the old filter and discard it.
    • Pro tip: Some mechanics recommend priming the new oil filter by dipping it in fresh engine oil or half-filling its cavity before installation for improved initial lubrication and pressure build-up.
    • Insert the new filter and reattach the cover, tightening bolts evenly to avoid leaks.
  4. Reinstall Plugs and Screens
    • Insert cleaned oil screens and plugs back into their respective locations. Tighten to the specifications given in your owner’s manual to avoid over-torquing, which can strip threads or crush O-rings.
  5. Add New Oil
    • Remove the oil fill cap and, using a clean funnel, pour in 1.2 liters (1.27 quarts) of your preferred oil. Do not exceed the specified capacity–overfilling can cause foaming and poor engine performance.
    • Wipe away any spilled oil and reinstall the fill cap.
  6. Start and Check Oil Level
    • Start the engine and let it idle for 2-3 minutes to circulate the new oil.
    • Switch off and allow the bike to rest for a minute or two.
    • Check the oil level using the sight glass on the engine case. The oil should appear between halfway and three-quarters up the window; add oil if necessary, but do not overfill.

2018 Husqvarna FS 450 Specific Call-Outs

  • Oil Capacity: 1.27 quarts/1.2 liters per full change, including filter.
  • Recommended Oil: Use oils meeting JASO MA2 and API SN or higher; 10W-50 synthetic is preferred for performance, shifting, and clutch life.
  • Oil Screens: The FS 450 (like other Husqvarna 450/501 models) uses two screens–failure to remove and clean both at each change can leave debris in the engine, risking bearing damage.
  • Oil Filter Priming: While not mandatory, pre-soaking or filling the oil filter cavity prior to installation assists with proper oil pressure on first startup.
  • Tightening Sequence: Always use a torque wrench and refer to your model-specific torque specs for the drain plug, filter cover, and screen plugs to avoid stripping soft aluminum threads.

Tips, Best Practices, and Cautions

  • Dispose of used oil and filters ethically, using a local recycling or hazardous waste center.
  • Never use substandard oil or filters; the FS 450 is a high-performance model that benefits most from quality, full-synthetic lubricants and OEM-quality filtration.
  • Be wary of over-tightening any fasteners into the magnesium or aluminum cases–a stripped thread may require expensive repairs.
  • Refer to the official Husqvarna service manual (available via Husqvarna support) for part numbers, schematics, and any future technical updates.
  • Reset any maintenance reminders if your FS 450 is equipped with digital service notifications.

Performing your own routine oil change on the 2018 Husqvarna FS 450 helps ensure its passionate power and broad reliability continue every ride. For all the OEM supplies and tools you need, shop MotoSport.com—your trusted source for every Husqvarna service part.

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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.