How to Change the Oil in a 2018 Suzuki RMX450Z: A Complete MotoSport.com Guide

Routine oil changes are vital for keeping your 2018 Suzuki RMX450Z running at peak performance. This detailed guide—exclusive to MotoSport.com—explains the tools you need, step-by-step instructions, and addresses the unique maintenance requirements of this model.

Tools and Supplies Needed

  • 10mm and 8mm sockets (and driver or T-handle)
  • Oil drain pan
  • Clean funnel
  • Fresh engine oil (1,200ml or 1.2 liters, high-quality 4-stroke motorcycle oil)
  • Replacement oil filter (cartridge type)
  • Gloves
  • Rags or shop towels
  • Picks or flathead screwdriver (to remove filter cover)
  • Torque wrench (recommended for reinstalling bolts)
  • Drain plug crush washer (new, highly recommended)

Pre-Change Preparation

  • Make sure the motorcycle is on a level surface and is securely supported.
  • Warm up the engine for a few minutes to thin the oil, which helps it drain more thoroughly.
  • Turn off the bike and let it cool for a moment so parts are not too hot to touch.

Step-by-Step Oil Change Procedure for 2018 RMX450Z

  1. Remove the Skid Plate (if equipped):
    • Use an appropriate socket or Allen wrench to remove the skid plate for easier access to the drain bolt and oil filter.
  2. Locate and Remove the Drain Plug:
    • The main oil drain bolt is located under the engine—typically a 10mm bolt.
    • Place your drain pan under the bolt, then carefully loosen and remove it.
    • Allow all the oil to drain. Be patient—tip the bike gently if needed but do not over-lean.
  3. Check and Clean Oil Screens:
    • The 2018 RMX450Z is equipped with two oil screen filters (also called strainer screens). These should be removed and cleaned during every oil change.
    • Locate the strainers (usually behind smaller side bolts or covers) and remove them, noting orientation. Clean with solvent or parts cleaner, then let them dry completely before reinserting.
  4. Replace the Oil Filter Cartridge:
    • On this model, there is a single cartridge-type oil filter accessed by removing the filter cover (held by two or three bolts, generally 8mm).
    • Remove bolts, carefully pull the old filter out (note the direction), and discard. Wipe any sludge from the filter chamber.
    • Lubricate the new filter's O-ring with a few drops of clean motorcycle oil and install in the correct orientation.
    • Replace the filter cover, tightening bolts evenly and to spec (see your service manual for precise torque values).
  5. Replace the Crush Washer and Reinstall Drain Bolt:
    • Always use a new crush washer on the drain bolt to prevent leaks.
    • Tighten the drain bolt to the manufacturer's torque specification (refer to your manual).
  6. Refill with Fresh Oil:
    • Remove the oil fill cap and use a funnel to add 1,200ml of oil (per the service manual and user feedback for 2018 RMX450Zs)

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    • Optionally, use an oil measuring jug to ensure accuracy.
    • Replace the fill cap when done.
  7. Start and Check Oil Level:
    • Start the bike and let it idle for 2-3 minutes. This circulates oil and fills the filter and various oil passages.
    • Shut off the bike and let it sit for another 2 minutes, then check oil level using the check bolt located on the crankcase.

    • Unscrew the check bolt slightly–if oil drips out, you are at the correct level. If not, add oil in small increments until it does.

Special Call-Outs for 2018 Suzuki RMX450Z Owners

  • Oil Change Frequency:
    • Suzuki recommends changing the oil every 6 hours of operation for optimal engine health. Riders who compete or ride hard may want to service more frequently

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  • Oil Capacity and Level Check:
    • The correct oil volume is 1,200ml (1.2L) for the 2018 RMX450Z (do not overfill)

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    • This model does not use a sight glass. The oil check bolt must be used to verify correct oil quantity

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  • Multiple Oil Filters:
    • The RMX450Z has one cartridge filter and two oil screen filters. All should be serviced at every oil change

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    • Installing any of these incorrectly can lead to oil starvation—double check placement and orientation on reinstallation.
  • Drain Bolt and Filter Torque:
    • Always follow your owner's or service manual for proper torque values when reinstalling the drain bolt and oil filter cover to avoid stripped threads or leaks.
  • Environmental Note:
    • Dispose of used oil and filters responsibly—most MotoSport.com-supported shops and many auto parts stores accept recyclables.

Tips for a Cleaner Oil Change

  • Wear gloves to protect your hands and for easier clean-up.
  • Warm oil drains more thoroughly but beware of hot parts.
  • Be careful not to overtighten bolts or overtighten the oil fill cap.
  • Check for leaks after your first short ride and retighten as needed.

Conclusion

Changing the oil in your 2018 Suzuki RMX450Z is one of the most straightforward yet impactful ways to ensure your bike delivers outstanding performance and durability. Regularly changing the oil and cleaning the filters per this guide will keep your RMX running flawlessly, whether you're on the trail or track.

MotoSport.com stocks all the OEM and aftermarket oil filters, crush washers, tools, and premium oils you'll need for your next oil service. Ride safe and enjoy your Suzuki RMX450Z.

Related Shopping Categories

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Shop Oil Fillers and Drain Plugs for a 2018 Suzuki RMX450Z Dirt Bike.

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.