How to Change the Oil in a 2015 KTM 85SX – MotoSport.com Guide

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Regular oil changes are essential maintenance for your 2015 KTM 85SX to ensure smooth operation and longevity of the engine and transmission. This detailed guide will walk you through each step, highlighting model-specific tips to keep your dirt bike running at its best.

Tools & Supplies Needed

  • 13mm socket or wrench (for drain plug)
  • 8mm socket or wrench (for gear oil level/check bolt)
  • Oil catch pan
  • Torque wrench (recommended)
  • Funnel
  • Rags or paper towels
  • Fresh gear oil (use a high-quality 15W-50 as per factory spec)
  • Replacement drain plug washer/seal ring (recommended)
  • Gloves (optional, for cleaner hands)

Preparation

  • Start the engine and let it run for a minute or two to warm up the oil. Warm oil flows out more easily, helping remove debris.
  • Switch off the bike and stand it upright on a level surface or bike stand.

Step-by-Step: Changing the Oil

  1. Remove the Drain Plug
    • Place the oil catch pan under the engine’s drain bolt.
    • Using your 13mm wrench or socket, loosen the gear oil drain plug, then remove it completely to begin draining the oil.
      Caution: The oil may be hot after warming up the engine.
    • Let the oil drain fully. This may take several minutes
  2. Clean and Inspect the Drain Plug
    • Thoroughly clean the drain plug and its magnetic tip. Some metallic debris is normal, but remove any buildup.
      Tip: Replace the sealing washer or O-ring to prevent future leaks.
  3. Reinstall the Drain Plug
    • Thread the plug and washer back in by hand to avoid cross-threading.
    • Tighten with your wrench. For best results, use a torque wrench and tighten to 20 Nm (14.8 ft-lb) for a leak-free seal.
  4. Fill With Fresh Oil
    • Remove the gear oil filler cap using an 8mm wrench.
    • Use a funnel to pour in the recommended gear oil. For the 2015 KTM 85SX, fill until oil just begins to drip from the oil level screw hole or reaches the bottom of the check hole – the factory spec is usually 500 mL (0.5 liters) for this model.
    • Do not overfill – too much oil can cause leaks or excess pressure.
  5. Replace the Oil Filler Cap & Level Plug
    • Once the oil is properly filled (when a slow drip escapes from the check hole), replace and tighten the 8mm check bolt and the filler cap.
  6. Check for Leaks & Final Steps
    • Start your engine and let it idle for a minute. Check for oil leaks at the drain and level bolts.
    • Wipe away any spills, dispose of the used oil safely, and enjoy your next ride.

2015 KTM 85SX Model-Specific Callouts

  • Always use high-quality oil matching factory viscosity (15W-50) and capacity (500 ml), as improper oil type/level can lead to transmission wear or shifting issues.
  • Be cautious with the magnetic drain bolt: this part is designed to catch metallic particles. Excessive debris could signal internal wear – check your manual or consult a mechanic if unsure.
  • Replace the sealing washer or ring each oil change for best leak prevention, as old crush washers may weep after repeated use.
  • If you ride aggressively or in sandy, wet, or racing conditions, shorten your oil change intervals for added protection.

Tips for a Perfect Oil Change

  • Measure your used oil. If it’s much less than 500 ml, check for leaks or burning.
  • Keep a maintenance log with date and oil type after every service.
  • Wipe all surfaces clean before and after filling to spot any issues fast and prevent contamination.
  • Dispose of oil responsibly—take it to a local shop or recycling center.

Maintaining your 2015 KTM 85SX is easy with the right tools, fresh oil, and a little time. Following these steps ensures reliable, smooth performance every time you head out to ride.

For more service tips and parts for your KTM, visit MotoSport.com—your dirt bike performance headquarters.

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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.