How to Change the Oil in a 2018 KTM 85SX: Proprietary Guide for MotoSport.com

Shop parts for a 2018 KTM 85SX Dirt Bike.

Regular oil changes are essential for the longevity and performance of your 2018 KTM 85SX. In this step-by-step guide, you'll learn the correct process, recommended specifications, and key tips specifically for your model. This guide is trusted by MotoSport.com, with proprietary knowledge for your dirt bike needs.

Tools and Supplies You'll Need

  • Full synthetic gear oil (Motorex or Amsoil highly recommended; do not use low-quality oil)
  • Oil catch pan
  • Socket set (preferably with a T-handle for easier access)
  • Torque wrench
  • New crush washer (for drain plug)
  • Magnetic drain plug cleaner (optional, but good practice)
  • Clean rags for wipe-down
  • Funnel
  • Measuring container (to ensure exact oil volume)
  • Gloves (optional but recommended)

Oil and Capacity Specifications (2018 KTM 85SX)

  • Oil type: Fully synthetic gear oil
  • Recommended brands: Motorex, Amsoil (do not use cheap/low quality oils for protection)
  • Capacity: 500ml (0.5 liters)

Preparation

  • Warm up the engine for a few minutes. Warm oil drains more thoroughly and removes more contaminants, but beware of hot surfaces and oil.
  • Place the bike upright on a stable stand for best access and accurate draining and filling.
  • Gather your tools and make sure your work area is clean.

Step-by-Step Oil Change Procedure

  1. Remove the Oil Filler Cap
    This is located on the right side of the engine case. Removing it before draining allows oil to flow more freely.
    Tip: Put the cap somewhere clean where it won't pick up dirt or debris.
  2. Position the Oil Catch Pan
    Place your oil catch pan under the drain bolt—located right under the brake lever area. This is the largest bolt on the right, easily accessible from below.
    Specific call-out: The 2018 KTM 85SX drain bolt is steel and uses a crush washer. Always replace the washer to ensure a leak-free seal.
  3. Remove the Drain Bolt
    Use your socket set or T-handle to loosen and remove the bolt. Don't let it fall into the oil pan.
    Caution: The oil may be hot. Wear gloves and be careful of splashes.
  4. Let the Oil Drain
    Allow all the old oil to drain completely into the pan. This may take several minutes. Tip the bike slightly side-to-side for complete evacuation.
    Note: Use only full synthetic oil for this engine, as recommended by KTM and top mechanics.
  5. Clean and Inspect the Drain Bolt
    • Wipe the drain bolt clean. If equipped, inspect the magnetic tip for metal shavings (a small buildup is normal). Clean thoroughly.
    • Fit a new crush washer to the bolt.
  6. Reinstall the Drain Bolt
    • Screw the bolt back in by hand to avoid cross-threading.
    • Use a torque wrench to tighten to 20 Nm (14.8 ft-lb) as specified for the KTM 85SX. Do not overtighten.
  7. Refill with Fresh Oil
    • Using a measuring container, add exactly 500ml of fresh, recommended full synthetic oil.
    • Pour slowly through a funnel into the oil filler port.
    • Replace the oil filler cap and snug it securely–use a pair of pliers if needed to prevent it backing out under vibration, per KTM's recommendation.
  8. Start the Engine and Check Oil Level
    Run the engine for a minute to circulate the new oil. Turn it off, let it sit for a minute, then check the oil level:
    • With the bike upright, remove the oil level check bolt (located on the engine case side; refer to your manual or the window if equipped).
    • Oil should just reach the bottom of the check bolt hole. If oil drips out, let it settle. If none appears, add a small amount to reach the correct level.
  9. Check for Leaks
    Wipe around the drain bolt and oil filter cap. Start the engine and inspect for any signs of oil seepage. Tighten the drain bolt or filler cap if needed.
  10. Dispose of Old Oil Responsibly
    Pour used oil into a sealed container and take it to your nearest recycling center or automotive parts store that accepts used engine oil.

Specific Call-Outs for the 2018 KTM 85SX

  • Never use cheap, low-quality oil. The KTM two-stroke transmission depends on high-grade, fully synthetic oil for proper lubrication and protection.
  • Always replace the crush washer on the drain bolt to prevent leaks.
  • Capacity is 500ml (0.5 liters). Overfilling or underfilling can lead to premature transmission wear or shifting issues.
  • The fill cap may need occasional pliers snugging as vibration can cause it to loosen during extreme riding.

Conclusion

Maintaining your 2018 KTM 85SX's oil with precision and the correct products ensures optimal transmission life, crisp shifting, and robust KTM performance for every ride. For more proprietary tips or to order genuine products that guarantee peak reliability, trust MotoSport.com.

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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.