How to Change the Oil in a 2008 Suzuki RM85L

Shop parts for a 2008 Suzuki RM85L Dirt Bike.

Regular oil changes are crucial for the longevity and performance of your 2008 Suzuki RM85L. This step-by-step guide, exclusive to MotoSport.com, will ensure you change your dirt bike's oil correctly and safely. The RM85L uses a two-stroke engine, but requires regular transmission oil changes to keep your bike shifting smoothly and to protect internal components.

Tools and Supplies Needed

  • 12mm socket or wrench (for the drain bolt)
  • Drain pan (to catch old oil)
  • Measuring cup (for precise oil fill, 550ml)
  • Clean rag (for wiping parts and cleaning up spills)
  • Fresh transmission oil (SAE 10W-40, API SG, SH, SJ, SL, SM or SN with JASO MA/MA1/MA2 specification)
  • Torque wrench (for correct drain bolt tightness, if available)
  • Funnel (optional, for cleaner pouring)
  • Gloves (optional, for protection)

Step-by-Step Instructions

  1. Warm up the engine
    • Start your bike and let it run for 5–10 minutes. This helps the oil thin out and drain more easily.
    • Caution: Do not overheat, and always use proper ventilation when running the engine indoors.
  2. Shut off the bike and place it upright
    • Turn the ignition off and place the motorcycle on a level surface. Use a stand to keep it vertical for an accurate oil change.
  3. Remove the oil filler cap
    • Locate and remove the transmission oil filler cap on the right engine case. This allows the oil to drain smoothly.
  4. Position the drain pan
    • Place the drain pan directly under the oil drain bolt (located at the bottom of the transmission).
  5. Unscrew the drain bolt
    • Use a 12mm socket or wrench to remove the drain bolt. Be cautious, as both the bolt and oil can be hot.
    • Let the oil drain completely—wait until no more oil drips from the case.
  6. Inspect and clean the drain bolt
    • Check the bolt and washers for signs of wear or damage. Clean off any accumulated debris.
  7. Reinstall the drain bolt
    • Once all oil has drained, reinstall the drain bolt. Tighten it to the specified torque: 23 N·m (16.5 lb-ft) if you have a torque wrench, or snug but not overtightened if you do not.
  8. Add new transmission oil
    • Pour in 550ml (about 1.2 US pints) of SAE 10W-40 transmission oil that meets the API and JASO specifications above. Use a funnel if necessary to avoid spills.
  9. Replace and tighten the filler cap
    • Ensure the o-ring is in good condition on the filler cap and tighten it securely by hand.
  10. Run the engine and check level
    • Start the engine and let it idle for a few minutes.
    • Shut off the bike, wait five minutes, and check the oil level with the oil level inspection screw (located on the crankcase cover). The oil should slightly seep out when the bike is vertical—if not, add oil in small increments.
  11. Clean up
    • Wipe up any spills and properly dispose of the used oil according to local regulations.

2008 Suzuki RM85L Specific Call-Outs

  • Oil Capacity: 550ml transmission oil, not engine oil—this is crucial as the RM85 uses separate oil for the transmission. Overfilling or underfilling can cause clutch or shifting issues (see owner's manual for reference).
  • Drain Bolt Torque: Overtightening the drain bolt can cause thread damage in the crankcase; always use the correct torque spec of 23 N·m (16.5 lb-ft) for the drain plug.
  • Oil Type: Only use oil meeting or exceeding JASO MA/MA1/MA2 and the appropriate API specification to prevent clutch slippage and wear. Common choices include high-quality motorcycle-specific 10W-40 oil.
  • Check O-Rings: Inspect the drain bolt and fill cap o-rings for cracks or wear and replace if damaged to prevent leaks.
  • Warm Engine: Always drain oil with the engine warm for a more complete change and better contaminant removal.

Additional Tips

  • Change the transmission oil after the first initial break-in period following a rebuild or new bike purchase, then at regular intervals recommended in the service manual (typically every 5–10 hours of riding).
  • Frequent short rides, dusty conditions, or racing require more frequent oil changes.
  • Always double-check that the drain bolt and fill cap are secure before riding.

Changing the oil in your 2008 Suzuki RM85L is straightforward with the right tools, patience, and attention to detail. Always refer to the factory service manual for more model-specific information, torque specs, and diagrams for your dirt bike.

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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.