How to Change the Oil in a 2020 Husqvarna FX350

Shop Parts for a 2020 Husqvarna FX350 Dirt Bike.

Changing the oil regularly on your 2020 Husqvarna FX350 is essential for peak engine performance and longevity. The process is straightforward and can be handled at home with some basic tools and a little patience. Here's everything you need to know for a successful oil change, including tools required, step-by-step instructions, and model-specific tips.

Tools & Parts Needed

  • 8mm socket or T30 Torx bit (for skid plate, if fitted)
  • 13mm wrench or socket (for drain plugs and screens)
  • Oil catch pan
  • OEM oil filter (part #77338005100 recommended)
  • OEM oil filter cover O-ring
  • OEM strainer screen O-ring
  • OEM drain plug O-ring
  • OEM crush washer
  • Fresh oil (Motorex 4T Power Synth 10W-50, 1 Liter)
  • Funnel
  • Torque wrench (for reassembly)
  • Clean rags
  • Rubber gloves (optional)

Most of these parts come together in an oil change kit for 2017–2024 Husqvarna FX350 models for added convenience.

Step-by-Step Oil Change Process

  1. Warm Up the Engine

    Start your FX350 and let it idle for 3–5 minutes. This thins the oil, helping it drain completely. Shut off the engine and let the bike cool slightly for safety.

  2. Remove the Skid Plate (if equipped)

    Use an 8mm socket or T30 Torx bit to loosen and remove the bolts securing the skid plate. Gently pull the plate down and forward to gain access to the oil filter and drain bolt.

    If your bike has a stock skid plate, it often comes off easily. After removal, set it aside.

  3. Remove the Oil Filler Cap

    Unscrew the oil filler cap on the side of the engine. This allows air to enter and oil to drain more freely.

  4. Drain the Old Oil

    Place an oil catch pan beneath the drain bolt (located at the bottom left side of the engine). With your 13mm wrench, carefully loosen and remove the drain plug. Let the oil drain fully.

    Model-specific tip: The 2020 FX350 drain plug is located behind the frame, making access slightly restricted. Use an open-end wrench if a socket won't fit easily.

    Inspect the drain plug and magnet for metallic debris, which can indicate excess engine wear.

  5. Remove and Inspect Oil Strainer Screens

    Your 2020 FX350 has at least one oil strainer (screen). Locate it and use a 13mm wrench or socket to remove. Pull out the screen and inspect for debris. Clean thoroughly with brake cleaner or a lint-free rag before reinstalling.

    Replace the screen's O-ring with a new one from your kit to ensure a perfect seal.

  6. Remove and Replace the Oil Filter

    Locate the oil filter cover, secured by two 8mm bolts. Remove these and take off the cover. Pull out the old oil filter and O-ring.

    Install the new oil filter and O-ring. Ensure the filter is seated properly before reinstalling the cover and tightening bolts to the manufacturer's torque spec.

    Double-check the cover O-ring is positioned correctly to avoid leaks.

  7. Install New O-Rings and Crush Washer

    Replace the crush washer on the drain plug and any O-rings for the plug, screens, and cover. Applying a thin layer of fresh oil to new O-rings can help with installation and sealing.

    Thread in the drain bolt and screen(s) by hand, then torque to spec per your owner's manual.

  8. Add Fresh Oil

    Double-check that all plugs and the filter cover are installed. Using a funnel, pour in the recommended amount of fresh oil (typically around 1 liter for the 2020 FX350, but confirm with your owner's manual).

    Replace the filler cap.

  9. Start and Check for Leaks

    Start the bike and let it idle for a minute. Check around the drain bolt, filter cover, and screens for oil leaks. Stop the engine and let it sit for a few minutes, then check the oil level via the inspection window or dipstick. Top off if necessary.

  10. Reinstall Skid Plate

    If you removed your skid plate, reinstall it using the same fasteners and torque them securely.

FX350 Model-Specific Call-Outs

  • Access: The 2020 FX350 shares its oil change procedure with other Husqvarna and KTM 350 models from 2017–2024, but tight access to the drain bolt may require an open-end wrench instead of a socket.
  • Oil Capacity: Always verify the correct oil capacity and torque specs in your model's manual, as small changes do occur year-to-year. For the FX350, the capacity is generally about 1 liter.
  • Service Interval: Husqvarna recommends oil changes at least every 15 hours of ride time—possibly more often in race conditions.
  • Kit Convenience: Pre-assembled oil change kits are fit for the 2020 FX350 and simplify the entire process by including all the correct seals, filters, and oil.

Pro Tips for a Clean Oil Change

  • Dispose of old oil properly—never dump it in the trash or driveway. Take it to a local recycling center.
  • Always use high-quality oil and OEM or equivalent filters and seals for best results.
  • Inspect for metal shavings—small bits may indicate normal wear, but chunks or excess debris should prompt further investigation.

This proprietary guide was created for MotoSport.com customers and is tailored to the 2020 Husqvarna FX350, though it applies to 2017–2024 FX350s and many KTM 350s with slight modifications. Happy wrenching, and enjoy peak performance on your ride.

Related Shopping Categories

Shop Motor Oil for a 2020 Husqvarna FX350 Dirt Bike.

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Shop Oil Drain Pans for a 2020 Husqvarna FX350 Dirt Bike.

Shop Tools for a 2020 Husqvarna FX350 Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2020 Husqvarna FX350 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.