How to Change the Oil in a 2012 Suzuki RM85L: A Complete Guide

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Keeping your 2012 Suzuki RM85L maintained is the key to consistent performance and long-term reliability. Regular oil changes are essential maintenance for this two-stroke dirt bike’s transmission. This guide, brought to you by MotoSport.com, will explain the tools you need, each step in the process, and call-outs specific to your RM85L so you can perform a professional-quality oil change in your own garage.

Tools and Materials Needed

  • Socket Wrench Set (10mm, 12mm, or as specified for drain bolt)
  • Torque Wrench
  • Measuring Cup (preferably a Ratio Rite or similar, for exact measurement)
  • Oil Drain Pan
  • Clean Rags or Shop Towels
  • Suzuki-Recommended Gear/Transmission Oil (use manufacturer spec, typically SAE 10W-40 or 80W transmission oil; double-check your owner’s manual for oil capacity and recommendation)
  • Funnel
  • Gloves (optional, for a cleaner job)

Before You Begin: Important Suzuki RM85L-Specific Notes

  • The 2012 RM85L uses a separate transmission oil system from its two-stroke engine. Only the transmission oil needs to be changed as per regular service intervals.
  • The oil filler and drain plug locations are easily accessible, but care must be taken not to over-tighten and strip threads in the aluminum case.
  • Be sure to use only the recommended quantity of oil: 400cc (0.42 US qt) for the transmission oil change. Never overfill.
  • Check the O-ring or sealing washer on the drain plug. Replace if it’s flat, cracked, or damaged to prevent leaks.

Step-by-step Process

  1. Warm up the bike
    • Start your RM85L and let it idle for about 2–3 minutes. This warms up the oil for easier draining and helps remove contaminants from the transmission case.
  2. Place bike on a level surface
    • Use a center stand or triangle stand so the bike is vertical. This ensures the oil drains completely and you accurately refill to the proper level.
  3. Remove the fill cap
    • Loosen and remove the transmission oil fill cap located on the right side of the engine case. This prevents a vacuum from forming and helps the oil drain freely.
  4. Drain the old transmission oil
    • Position your drain pan directly under the drain plug (typically on the bottom of the right case).
    • Use the appropriate socket to loosen and remove the drain plug. Allow all oil to drain. Wipe away any debris around the plug opening with a clean rag.
  5. Inspect and clean the drain plug
    • Check for metal shavings on the drain plug’s magnetic tip. A small amount of fine filings is normal, but chunks could indicate a problem.
    • Wipe clean with your rag and replace the O-ring or sealing washer if needed.
  6. Reinstall and torque the drain plug
    • Thread the drain plug in by hand to avoid cross-threading. Tighten to the manufacturer’s torque spec: 16.5 ft-lb for the RM85L drain plug. Never overtighten as the cases are aluminum and easily damaged.
  7. Refill with fresh transmission oil
    • Using a measuring cup, pour exactly 400cc of Suzuki recommended gear/transmission oil into the fill hole. Use a funnel if needed to avoid spills.
    • Let the oil settle. Visually double-check the level (if sight glass or dipstick equipped; RM85L typically just has a fill hole, so stay precise with your measurement).
  8. Replace the fill cap
    • Ensure the O-ring on the fill cap is in good condition, then re-install. Hand-tighten only; do not over-tighten.
  9. Check for leaks
    • With the bike still upright, visually inspect around the drain plug and fill cap for oil leaks. Wipe away any drips and tighten slightly if necessary.
  10. Start and idle the bike
    • Start the engine, let it idle for a minute, then turn it off. Check again for leaks. You’re ready to go ride.

Common RM85L Oil Change Mistakes to Avoid

  • Overfilling the transmission oil can cause leaks or clutch problems. Always use the recommended 400cc.
  • Forgetting to replace worn or damaged O-rings or washers increases the risk of leaks.
  • Cross-threading or over-tightening the drain bolt can strip threads in the aluminum case — thread bolts by hand first and use a torque wrench.

Conclusion

Changing the transmission oil in your 2012 Suzuki RM85L is quick, easy, and essential for consistent performance on the track or trail. Always use OEM-quality oil and parts, and take care not to damage the engine case threads during the oil change process. Regular oil changes, as part of your routine maintenance, are one of the best ways to keep your RM85L in top running condition and extend its life.

For more Suzuki dirt bike maintenance guides and genuine Suzuki parts for your RM85L, choose MotoSport.com—your source for everything motocross.

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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.