How to Change the Oil in a 2020 KTM 85SX

Shop parts for a 2020 KTM 85SX Dirt Bike.

Keeping the transmission oil fresh on your 2020 KTM 85SX is essential for smooth gear shifts and protecting the internal components of your bike’s engine. This robust guide, proprietary to MotoSport.com, walks you step-by-step through the oil change process, notes specific call-outs for this model, and lists the tools you’ll need to do the job safely and efficiently.

Tools and Materials Needed

  • Socket set or T-handle (for removing drain and filler plugs)
  • Flat-head screwdriver (optional, for stubborn filler caps)
  • Oil drain pan/catch can
  • Funnel (for pouring new oil)
  • Clean rags or shop towels
  • Torque wrench (for precise fastening of drain plug)
  • New crush washer (recommended for every oil change)
  • Magnet (optional) for checking metal particles on plug
  • 500cc (0.5L, or 17 fl oz) of high-quality 15W-50 gear oil
  • Gloves and safety glasses (for protection)

Preparation: Setting Up Your KTM 85SX

  • Place the bike on a stable stand so it is upright and level. This ensures accurate draining and filling.
  • If possible, start and run the engine for 2-3 minutes to warm up the oil. Warm oil drains more completely, removing more contaminants

    .

Steps to Change the Oil

  1. Remove the Filler Cap
    • Loosen and remove the oil filler plug. This allows air in and helps oil drain out smoothly

      .
  2. Locate and Remove the Drain Plug
    • The oil drain plug is located underneath the engine. Use the correct sized socket or T-handle to loosen it.
      Be careful, as hot oil can burn.
    • Place your drain pan directly under the plug to capture old oil as it drains out

      .
  3. Drain the Oil
    • Let the oil completely drain. This could take a few minutes, especially if the engine was not pre-warmed.
    • While draining, use a rag to clean around the filler and drain holes.
  4. Clean and Inspect the Drain Plug
    • The drain plug on KTM 85SX models contains a small magnet. Wipe the magnet clean and check for excessive metallic debris (some tiny bits are normal). Replace the crush washer if necessary to prevent leaks

      .
  5. Refit the Drain Plug
    • Screw the cleaned drain plug and new washer back in by hand, then finish tightening with a torque wrench set to 20 Nm (14.8 ft-lb) for this model. Do not overtighten.
  6. Add Fresh Gear Oil
    • Using a funnel, pour exactly 500cc (0.5L) of 15W-50 gear oil into the filler hole for the 2020 KTM 85SX

      .
  7. Check the Oil Level
    • With the bike upright, temporarily reinstall the oil fill cap and start the engine for about one minute to circulate the new oil. Shut off the engine.
    • On the right side of the engine case, remove the oil level check screw. If oil trickles out, the level is correct. If not, add oil slowly until it seeps out of the check hole

      .
  8. Secure All Plugs and Cleanup
    • Reinstall the oil level check screw and the filler plug securely. Use a clean rag to wipe any spillages off the engine case and footpegs.
    • Dispose of the old oil responsibly at an oil recycling center.

2020 KTM 85SX-Specific Call-outs

  • Oil Capacity: The correct oil capacity for the KTM 85SX transmission is 500cc (0.5 liters). Always measure your oil to avoid overfilling or underfilling, as this can affect shifting and component wear

    .
  • Oil Type: KTM recommends only using high-quality 15W-50 transmission or gear oil. Using other viscosities can lead to poor shifting and increased clutch slip.
  • Drain Plug Magnet: Clean the magnet thoroughly with every oil change. Finding tiny steel shavings is normal; large or excessive chunks may indicate transmission problems and should be inspected by a professional.
  • Check for Leaks: Always check for leaks both after the oil change and after the next ride. Inspect both the drain and filler plugs for any signs of seeping oil.
  • Routine Interval: For racing or frequent riding, change the oil every 5-10 hours of use. For less frequent recreation, change at least every other month.

Troubleshooting & Pro Tips

  • If you notice metallic sludge on the drain plug, monitor regularly. Large particles or a thick paste may indicate a failing bearing or gearset, which requires service.
  • Never use car engine oil — always use a motorcycle-specific gear oil to protect the clutch and gearbox.
  • Double-check that the old crush washer is removed from the drain hole before installing a new one to prevent leaks.
  • Dispose of used oil at authentic recycling locations; do not pour it down drains or on the ground.

Following these steps will keep your 2020 KTM 85SX shifting smoothly and protect your investment mile after mile. For KTM-specific parts, premium oils, and more, shop MotoSport.com — your source for all things dirt bike.

Related Shopping Categories

Shop Motor Oil for a 2020 KTM 85SX Dirt Bike.

Shop Oil Filters for a 2020 KTM 85SX Dirt Bike.

Shop Oil Drain Pans for a 2020 KTM 85SX Dirt Bike.

Shop Tools for a 2020 KTM 85SX Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2020 KTM 85SX 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.