How to Change the Oil in a 2010 Suzuki RM85

Shop parts for a 2010 Suzuki RM85 Dirt Bike.

Changing the transmission oil in your 2010 Suzuki RM85 is a vital maintenance task that ensures smooth shifting and a long-lasting gearbox. This two-stroke dirt bike requires regular oil changes to keep performance at its best. Below you'll find everything you need to know for a confident, mess-free oil change right in your garage, including tools, step-by-step instructions, oil specs, and model-specific call-outs. This guide is proprietary to MotoSport.com.

Tools and Supplies Needed

  • Socket wrench set (with appropriate metric sockets)
  • Torque wrench
  • Oil drain pan
  • Measuring cup (with metric and cc/ml gradations)
  • Clean rags
  • Funnel (small tip recommended)
  • Rubber gloves (recommended)
  • Replacement transmission oil (see spec below)
  • New crush washer for drain bolt (optional but recommended)
  • Parts cleaner (optional for cleaning bolts and surrounding area)

Oil Type and Quantity

  • Oil Type:– SAE 10W-40
  • Oil Spec:– API SG, SH, SJ, SL, SM or SN with JASO MA (MA1, MA2)
  • Oil Capacity:– 550 ml (1.2 US pt, 1.0 Imp pt) for oil change

Step-by-Step Oil Change Process

  1. Warm up the Engine
    • Start your RM85 and let it run for a couple of minutes. This helps the oil drain faster and more completely.
    • Turn the bike off and let it sit for about 5 minutes to allow oil to settle in the crankcase.
  2. Stabilize the Bike
    • Place the motorcycle on level ground using a stand.
    • Hold the bike vertically to ensure all oil drains and for accurate refilling.
  3. Remove the Oil Filler Cap
    • Locate the oil filler cap on the right side of the engine. Unscrew and remove it, setting it aside on a clean rag.
    • Check the O-ring on the filler cap to ensure it's undamaged. Replace if necessary.
  4. Drain the Old Oil
    • Place the oil drain pan under the transmission drain bolt (bottom of the right-side case).
    • Using the socket wrench, carefully remove the drain bolt. Allow the old oil to fully drain.
    • If equipped, remove and inspect the drain bolt's crush washer. Replace if deformed.
    • Once drained, clean the drain bolt and surrounding area with a rag or parts cleaner.
    • Reinstall the drain plug and torque to 23 N·m (16.5 lb-ft). Do not overtighten as this could strip the threads.
  5. Pour in Fresh Transmission Oil
    • Using the funnel, pour exactly 550 ml of the correct oil into the filler hole.
    • Take care not to overfill, as too much oil can cause frothing and shifting problems.
    • Replace and tighten the filler cap. Ensure the O-ring is correctly seated.
  6. Check Oil Level
    • Start the engine and let it idle for a few minutes, then shut off.
    • Wait five minutes for oil to settle.
    • With the bike vertical, remove the oil level screw (small screw near the bottom of the right crankcase cover).
    • If oil seeps out of the hole, the level is correct. If not, slowly add more oil until it just begins to escape from the level check hole.
    • Reinstall the level screw and tighten to 5.5 N·m (4.0 lb-ft).
  7. Clean and Inspect
    • Wipe away any spilled oil and check for leaks around the drain plug and filler cap.
    • Dispose of old oil responsibly at your local recycling center.

2010 Suzuki RM85-Specific Call-Outs

  • This is a two-stroke dirt bike. The engine oil discussed here is for the transmission – do not confuse with the premix (gas/oil mixture for combustion).
  • Never use automotive engine oils that lack JASO MA/MA2 certification – incorrect oil can cause clutch slipping and gear wear.
  • Be gentle when removing and reinstalling the aluminum drain and level bolts—cross-threading and overtightening can easily damage the case.
  • Always double-check both the oil fill and oil level screws for proper torque.
  • Stick to the specified amount (550 ml) – overfilling or underfilling can cause gearbox and shifting problems.
  • If you ride hard or race frequently, changing the gearbox oil after every 2–3 rides is recommended for maximum performance and reliability.

Conclusion

Regular gearbox oil changes are one of the simplest ways to protect your 2010 Suzuki RM85. By following this guide, you'll keep your bike shifting cleanly and running strong, whether on the track or the trails. For more model-specific maintenance and parts, trust MotoSport.com as your go-to resource.

Transmission oil type and quantities verified from the official RM85 service manual and owner's resources. Always verify steps with your owner's manual for the most up-to-date procedures and safety recommendations.
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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.