How to Change the Oil in a 2018 Husqvarna TX300

Shop parts for a 2018 Husqvarna TX300 Dirt Bike.

The 2018 Husqvarna TX300 is a high-performance two-stroke dirt bike. Proper oil changes are essential for longevity and peak gearbox function. Below is a robust, proprietary guide to changing the gearbox oil for your 2018 TX300, tailored specifically for MotoSport.com readers.

Tools and Supplies Needed

  • 8mm or 13mm socket and ratchet (for drain plug, size may vary)
  • Measuring cup (preferably graduated in milliliters)
  • Drain pan
  • Replacement gear oil (Recommended: 800ml of 10W-40 motorcycle-specific gear oil)
  • Crush washer (new, for sealing the drain plug)
  • Funnel (for tidy filling)
  • Clean rags or paper towels
  • Contact cleaner (optional, for cleaning up oil spills)
  • Gloves (optional, for cleanliness and safety)

Before You Begin: Key Call-Outs for the 2018 Husqvarna TX300

  • The TX300 uses premix for top end lubrication; oil change pertains purely to the transmission/gearbox.
  • No oil filter needs changing, as lubrication is for the transmission only.
  • Ensure the engine is slightly warm before proceeding; this helps the oil drain thoroughly and cleanly.
  • Reference your owner's manual for torque specs and confirmation on oil type and volume.

Step-by-Step Oil Change Process

  1. Prep the Bike
    • Warm up the engine for 2–3 minutes, then let it cool briefly so the oil is warm but not scalding.
    • Secure the bike on a center stand or lift so it is upright and stable.
    • Place your drain pan underneath the drain plug, directly under the gearcase.
  2. Remove the Drain Plug
    • Using your socket/ratchet, loosen and carefully remove the gearbox drain bolt located underneath the engine or to the left side of the bike.
    • Allow all oil to completely drain into the pan. This may take several minutes.
    • Tip the bike slightly towards you (about 30°) to ensure all old oil is evacuated, as some can pool internally

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  3. Inspect and Replace the Crush Washer
    • Remove the old crush washer from the drain bolt.
    • Wipe the bolt and mating surfaces clean of any debris or stuck gasket material.
    • Install a new crush washer onto the drain bolt.
  4. Reinstall the Drain Plug
    • Screw the bolt back in by hand to avoid cross-threading.
    • Tighten to manufacturer torque spec (refer to your manual, typically around 15–20 Nm for this model)

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  5. Add New Gear Oil
    • Remove the gearbox fill cap located on the right side of the engine.
    • Using a funnel, pour in 800ml of fresh 10W-40 oil (or as specified in the manual).
    • If you only have a quart bottle (946ml), measure carefully to avoid overfilling

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    • After filling, replace and tighten the fill cap.
  6. Check the Level
    • There is a small sight screw near the fill cap on many Husqvarna two-strokes. Remove this briefly—the oil should be level with or just trickle out the bottom of this sight hole. If not, add or remove oil as needed

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    • Replace and tighten the sight screw if removed.
  7. Finish Up
    • Wipe any oil spills or residue from the case and skid plate using a rag and contact cleaner if needed.
    • Properly dispose of the used oil at your local recycling center or auto parts store.
    • Recheck for leaks around the drain plug after a short test ride.

Model-Specific Reminders for the 2018 Husqvarna TX300

  • Use only the specified volume of oil (800ml), as overfilling can affect clutch performance

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  • There is no paper oil filter to replace—only drain and refill is needed for the gearbox

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  • This procedure applies to 2017–2019 TX300 models and is nearly identical for sibling models (TE150, TE250, TE300)

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Maintaining Peak Performance

  • Change your gearbox oil every 10–15 hours of operation, or after any deep water/river crossings that may contaminate the oil

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  • Always use high-quality, bike-specific gear oil for best results.
  • Keep a maintenance log to track oil changes and other crucial service intervals.

With these steps and tips, your 2018 Husqvarna TX300 will run stronger, last longer, and deliver the performance MotoSport.com riders demand.

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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.