How to Change the Oil in a 2008 Suzuki RM85: Complete Step-by-Step Guide

Shop parts for a 2008 Suzuki RM85 Dirt Bike.

Changing the transmission oil in your 2008 Suzuki RM85 is a key maintenance step that ensures your dirt bike's longevity and optimal performance. This step-by-step guide, proprietary to MotoSport.com, will walk you through the entire process, outline the required tools, and provide specific call-outs for the RM85 model year. Whether you're new to dirt bike maintenance or a long-time enthusiast, follow these instructions carefully for a smooth and effective oil change.

Tools & Supplies Needed

  • 10mm socket or box wrench (for oil drain plug)
  • Allen key or socket as required for specific oil level screws
  • Torque wrench (with settings for 5.5 N–m and 23 N–m)
  • Drain pan (for catching old oil)
  • Measuring cup (minimum 600 ml capacity, for precise oil fill)
  • Funnel (for clean pouring)
  • Clean shop rag
  • Rubber gloves
  • Fresh transmission oil: SAE 10W-40, API SG, SH, SJ, SL, SM, or SN with JASO MA/MA1/MA2

Preparation and Safety

  • Work in a well-ventilated area and ensure the bike is on stable, level ground.
  • Allow the engine to run for a few minutes to warm the oil, which helps it drain more completely.
  • Shut off the engine and wait an additional 5 minutes before proceeding to let oil settle.

Step-by-Step Oil Change Instructions for 2008 Suzuki RM85

  1. Warm Up the Engine
    • Start your bike and allow it to idle for several minutes.
    • This helps thin the oil, allowing it to drain thoroughly.
    • Turn off the engine and wait 5 minutes for oil to settle.
      (Call-Out: RM85 users should be careful not to overheat the engine. Warming for 2–3 minutes is typically sufficient.)
  2. Stabilize the Bike
    • Place the motorcycle upright on a stand or hold it vertically on level ground to ensure accurate oil drainage and refill.
      (Call-Out: Avoid using the side stand as it will tilt the bike, potentially causing incorrect oil levels.)
  3. Remove the Filler Cap
    • Locate and remove the transmission oil filler cap on the right crankcase cover.
    • Set the cap and O-ring aside where they’ll stay clean.
  4. Drain the Old Oil
    • Place your drain pan under the engine.
    • Use a 10mm socket to loosen and remove the drain plug from the bottom of the crankcase.
    • Allow all the oil to drain; rocking the bike gently side to side can encourage full evacuation.
    • Inspect the drain plug for metal shavings. Clean and replace the crush washer if needed.
      (Call-Out: The RM85 drain plug torque setting is 23 N–m (16.5 lb-ft). Do not overtighten.)
  5. Reinstall the Drain Plug
    • Wipe the plug and threads clean; reinstall by hand first to avoid cross-threading.
    • Finish tightening with a torque wrench set to 23 N–m to prevent damage.
  6. Add Fresh Oil
    • Double-check you’re using the correct type and measure precisely 550 ml (1.2 US pt or 1.0 Imp pt).
    • Place a funnel in the filler opening and slowly pour the new oil.
    • Replace and tighten the filler cap securely.
      (Recommended Oil: SAE 10W-40, API SG or later, with JASO MA/MA1/MA2 approval)
  7. Verify the Oil Level
    • With the bike upright and on level ground, remove the oil level check screw.
    • Oil should flow out of the hole; if not, add oil a little at a time until it does.
      (Oil level screw torque on RM85: 5.5 N–m (4.0 lb-ft))
    • Reinstall and torque the oil level screw.
  8. Final Steps
    • Wipe any spills and double-check all bolts and screws for correct torque.
    • Start the bike, let it idle for a few minutes, turn it off, and inspect for leaks.
    • Repeat the oil level check if needed after the engine has run briefly.

Special Model-Specific Call-Outs for 2008 Suzuki RM85

  • Always use non-friction-modified oil (JASO MA/MA2) for proper clutch performance in the RM85 gearbox.
  • The proper capacity is 550 ml. Overfilling can cause gearbox drag, while underfilling can lead to premature wear or failure.
  • Verify all seals and gaskets for leaks when changing oil. If leaks are found, address them before riding.
  • Proper torque is crucial on these smaller bikes to prevent stripping of crankcase threads, especially for the drain and level screws.

Disposal of Used Oil

  • Collect old oil in a sealed container and bring it to a local recycling center or auto parts store that accepts used motor oil.
  • Never dispose of oil in household waste, on the ground, or down a drain.

Conclusion

By following these detailed steps and adhering to recommended specifications, you’ll keep your 2008 Suzuki RM85 running strong for countless rides. Regular oil changes are among the simplest yet most crucial maintenance tasks to protect your gearbox and overall bike investment.

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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.