How to Change the Oil in a 2018 Suzuki RM85: A MotoSport.com Exclusive Guide

Shop parts for a 2018 Suzuki RM85 Dirt Bike.

Changing the oil in your 2018 Suzuki RM85 is essential for smooth operation and long-term durability. This robust guide, created exclusively for MotoSport.com riders, will walk you through the process step-by-step, including the necessary tools, recommended oil type, and vital model-specific tips to help you get the job done right.

Tools and Materials Needed

  • 10mm or 12mm socket/wrench (for drain plug)
  • Torque wrench
  • Oil drain pan
  • Shop rags or paper towels
  • Funnel
  • Measuring cup or graduated container (for precise oil filling)
  • New transmission oil (SAE 10W-40, API SG, SH, SJ, SL, SM, or SN rated with JASO MA/MA1/MA2)
  • Replacement O-rings (if needed)
  • Gloves (optional, but recommended)

Preparation

  • Start your RM85 and let it idle for a few minutes to warm up the transmission oil. This helps the old oil drain quickly and fully.
  • Turn the engine off and wait a few minutes before starting work–this prevents burns from hot parts and allows the oil to settle.
  • Stabilize the bike on a level surface using a stand, ensuring the motorcycle is upright and vertical for an accurate oil level check and fill.

Step-by-Step Oil Change Instructions

  1. Remove the Oil Filler Cap
    Locate and remove the oil filler cap on the right side of the engine case. Place it somewhere clean.
  2. Drain the Old Oil
    • Position your oil drain pan beneath the drain plug.
    • Using a socket or wrench, carefully unscrew and remove the drain plug located at the bottom of the crankcase.
    • Allow all the oil to completely drain. This may take a few minutes.
    • While the oil is draining, inspect the drain plug and its washer/O-ring. Replace the O-ring if it appears damaged or worn.
  3. Reinstall the Drain Plug
    • Once drained, reinstall the plug by hand to avoid cross-threading.
    • Tighten it to 23 Nm (16.5 lb-ft) using a torque wrench. Do not overtighten, as the case threads are delicate.
  4. Fill With New Oil
    • Using a funnel for accuracy and cleanliness, pour in 550 ml (1.2 US pt) of fresh, high-quality SAE 10W-40 motor oil with the proper API and JASO ratings.
    • Double-check the amount with your measuring cup for precise filling.
  5. Reinstall the Filler Cap
    • Replace the oil filler cap and tighten securely by hand.
  6. Check the Oil Level
    • Start the engine and let it idle for a couple of minutes.
    • Turn off the engine and wait 5 minutes for the oil to settle.
    • With the bike still vertical, remove the oil level check screw (located below the filler cap). Oil should begin to trickle from the hole if filled properly.
    • If oil does not come out, slowly add more until it does, and reinstall the check screw.
    • Tighten the oil level screw to 5.5 Nm (4.0 lb-ft).

Proprietary Tips and 2018 Model-Specific Call-Outs

  • The 2018 RM85 is a two-stroke with a separate transmission oil system–do not put oil in the fuel tank or mix oil into the gasoline.
  • Always use JASO MA or MA2 certified oil. Using automotive oil without this certification can harm clutch performance.
  • Check for leaks under the bike during and after refilling–the 2018 RM85 uses aluminum case threads which can strip if overtightened.
  • If the oil level was low before draining, inspect for leaks or excessive clutch wear after refilling.
  • Always confirm both the drain plug and filler cap are torqued to specification to avoid drops in oil pressure or oil leaks over time.
  • Dispose of old transmission oil responsibly at a recycling center or auto parts store.

Final Notes

  • Conduct an oil change at the intervals recommended in your owner’s manual, or after 5–10 hours of hard riding—whichever comes first.
  • If you notice your oil turning milky, your crankcase may have ingested water; have your RM85 checked by a MotoSport.com certified technician.
  • Regular oil changes are the best investment you can make for the longevity and performance of your 2018 Suzuki RM85.

For OEM parts, premium oils, and more maintenance tips, visit MotoSport.com, your ultimate source for riding essentials and technical know-how.

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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.