How to Change the Oil in a 2018 Husqvarna TC85

Shop parts for a 2018 Husqvarna TC85 Dirt Bike.

Changing the oil is one of the most crucial maintenance tasks for keeping your 2018 Husqvarna TC85 running at peak performance. Not only does an oil change ensure smooth gearbox operation, but it also prolongs the life of vital components. This robust how-to guide is proprietary to MotoSport.com and walks you through every tool, step, and model-specific tip you need to know for a proper oil change.

Tools and Supplies Needed

  • 8 mm socket or wrench (for drain bolt)
  • Flathead screwdriver or appropriate tool for oil filler cap
  • Measuring cup (500cc/0.5L capacity)
  • Drain pan
  • Clean rags
  • Parts washer/cleaning spray (optional, for cleaning the area)
  • Gloves (optional but recommended)
  • Fresh gear oil (see notes below for type and capacity)
  • New crush washer (recommended on each change)

Oil Type and Capacity Call-Out for 2018 Husqvarna TC85

  • Oil capacity: 500cc of gear oil (not engine oil) is required for the Husqvarna TC85. Overfilling can cause excess pressure while underfilling risks fast wear and overheating.
  • Recommended oil: High-quality 2-stroke gearbox/gear oil, meeting the manufacturer's viscosity and performance specs. Double-check your owner's manual for the latest recommendations.

Step-by-Step Oil Change Instructions

  1. Warm Up the Bike
    Start the TC85 and let it idle for a couple of minutes. Warming the oil helps it drain more thoroughly and removes more contaminants.
  2. Secure the Bike
    Turn off the bike and place it upright on a stable stand. This ensures you’ll extract all of the old oil and refill to the correct level.
  3. Locate the Drain Plug
    Find the 8 mm drain plug on the lower side of the engine casing.
  4. Remove the Drain Plug
    Place a drain pan beneath the plug.
    Carefully loosen and remove the drain bolt with your 8 mm wrench/socket.
    Allow the old oil to drain completely. This may take several minutes; tilting the bike slightly side to side can help expel trapped oil.
  5. Inspect and Clean
    Inspect the drain bolt for any metal shavings or debris. If present, this could indicate abnormal wear.
    Wipe the bolt clean and replace the crush washer if necessary.
  6. Reinstall the Drain Plug
    With all old oil drained, reinstall the drain bolt hand-tight, then tighten with your wrench to the torque spec found in your owner's manual. Avoid overtightening.
  7. Remove the Gear Oil Filler Plug
    Locate the gearbox oil filler cap on the right side of the engine (usually accessed with a flathead screwdriver or appropriate wrench).
  8. Add New Gear Oil
    Using a measuring cup, pour exactly 500cc (0.5L) of gear oil into the gearbox.
    The TC85 uses a check bolt or sight hole to confirm correct oil level; oil should reach the bottom thread of the check bolt hole when the bike is upright.
  9. Verify Oil Level
    With the bike vertical, remove the level check bolt to confirm oil just dribbles out–not too much, not too little.
    Adjust as needed (add a bit if nothing comes out; remove if it gushes) before reinstalling the level check bolt.
  10. Refit the Filler Cap
    Reinstall the filler cap securely.
  11. Clean Up and Inspect
    Wipe any spilled oil from the engine area. Ensure all bolts and caps are tight and there are no leaks.

Model-Specific Tips and Warnings (2018 Husqvarna TC85)

  • Never overfill: Adding more than the recommended 500cc can cause increased crankcase pressure and may force oil past the seals, leading to leaks or clutch problems.
  • Inspect for leaks: Double-check both drain and filler bolts for leaks after your first short ride post-change.
  • Always use the correct grade of gear oil: Motor oil is not a substitute for gearbox oil in 2-stroke bikes like the TC85.
  • Change frequency: For racing and hard riding, consider changing oil after every major event or about every 10-15 operating hours.

Conclusion

Changing the oil on your 2018 Husqvarna TC85 is straightforward but essential. By following the correct steps, using the proper tools, and staying within the recommended oil type and amount, you’ll keep your dirt bike’s gearbox operating smoothly ride after ride. For premium tools, oil, and OEM parts, MotoSport.com is your go-to resource for everything related to dirt bike maintenance.

Related Shopping Categories

Shop Motor Oil for a 2018 Husqvarna TC85 Dirt Bike.

Shop Oil Filters for a 2018 Husqvarna TC85 Dirt Bike.

Shop Oil Drain Pans for a 2018 Husqvarna TC85 Dirt Bike.

Shop Tools for a 2018 Husqvarna TC85 Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2018 Husqvarna TC85 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.