How to Change the Oil in a 2018 Suzuki RMZ450 – MotoSport.com Guide
Routine oil changes are crucial to keep your 2018 Suzuki RM-Z450 running at peak performance. Following the correct steps and using the right tools is essential for preserving your engine life and maximizing clutch performance. This MotoSport.com proprietary guide will walk you through every step, including model-specific call-outs, recommended oil, torque specs, and tips to make your oil change straightforward and mess-free.
Tools & Supplies Needed
- Engine oil (MOTUL 300V 10W-40 or any SAE 10W-40, API SF/SG, SH/SJ, JASO MA-certified)
- New oil filter (recommended with every oil change)
- 8mm and 10mm socket or T-handle
- Ratcheting wrench or socket driver
- Pick or small flat-head screwdriver (for removing the old oil filter gasket)
- Drain pan
- Shop rags and gloves
- Measuring cup or graduated funnel (to ensure correct oil amount)
- Replacement crush washer or gasket (for drain plug and magneto cover bolt)
Preparation & Safety
- Warm up the engine for a few minutes to thin the oil for easier draining. Check that the radiators are warm but not hot to the touch.
- Find a level work area and secure your bike upright using a bike stand.
Step-by-Step Oil Change Process
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Remove the Fill Cap
Take off the oil filler cap to allow air to aid efficient draining. This is located near the top left side of the engine. -
Remove Magneto Cover Guard (If Equipped)
For easier access to the drain points, remove the magneto cover guard using your socket or T-handle wrench (not all years have this guard installed). -
Locate and Remove Drain Plugs
- The primary oil drain plug is beneath the engine; use a 10mm socket and be careful not to strip the bolt.
- There's also a magneto cover bolt on the left case cover that must be removed to fully drain the engine oil system and sump (unique call-out for RM-Z450 – don't skip this step for a complete drain.).
- Drain the oil into your pan.
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Depress the Kick Starter
While avoiding engine start (hold down the kill switch), kick the starter 10 times or more. This action circulates residual oil out of passages, allowing a more thorough drain. -
Inspect and Replace Crush Washers
Always install fresh crush washers or gaskets on the drain plug and magneto cover bolt to ensure a leak-free seal at reinstallation. -
Reinstall Drain Plugs
- Tighten the oil drain plug to 12 N·m (8.5 lb-ft).
- Tighten the magneto cover bolt to 11 N·m (8.0 lb-ft).
- Do not overtighten, as alloy threads are easily damaged.
- Reinstall the magneto cover guard if you removed it.
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Replace the Oil Filter
- Remove the oil filter cover using your socket (location: right side of engine near header pipe).
- Extract the old oil filter and discard it responsibly.
- Clean the filter housing and mating surfaces with a rag.
- Lubricate the new filter’s rubber gasket lightly with engine oil and install it with the “OUT” or “engine side” mark facing inwards (per manufacturer’s direction).
- Reinstall the cover and tighten its bolts evenly.
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Add New Oil
- Pour in fresh engine oil. For the 2018 RM-Z450, the typical fill volume (including oil filter change) is about 1.05 liters (1.11 US qt), but always reference your owner’s manual for the exact specification and do not overfill.
- Use a funnel or measuring cup for accuracy.
- Reinstall the filler cap.
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Check Oil Level and Final Steps
- With the bike upright and level, start the engine and let it idle for 30–60 seconds. Shut it off and wait a minute.
- Check the oil level using the sight glass or dipstick as specified by your manual.
- Add oil if needed, being careful not to overflow.
- Wipe down any drips and inspect for leaks.
Model-Specific Call-Outs for 2018 Suzuki RM-Z450
- Dual-Drain System: The RM-Z450 uses both a main drain plug and the magneto cover bolt for complete oil removal. Skipping the second bolt can leave old oil and contaminants in the engine.
- Service Interval: Suzuki recommends changing the oil every 6 hours of engine operation under race or high-load use. Routine maintenance enhances clutch durability and engine longevity.
- Tightening Caution: Threaded aluminum engine cases strip easily. Always use a torque wrench and follow factory specifications: 12 N·m (drain), 11 N·m (magneto bolt).
- Recommended Oil: Many riders report smoother shifts and better clutch life with high-quality synthetic oil such as MOTUL 300V 10W-40.
- Compatibility Note: The oil change procedure is nearly identical for RM-Z450 models from 2008–2018, with only minor cosmetic and casting changes across years.
Disposal & Environmental Tips
- Dispose of used oil and filters responsibly at your local recycling facility—never pour down the drain or on the ground.
Conclusion
Changing oil on your 2018 Suzuki RM-Z450 is straightforward with the right steps and attention to detail. Always double-check torque specs, oil type, and quantities for your specific bike. For more expert dirt bike maintenance guides, visit MotoSport.com—your authoritative source for performance parts, tools, and how-tos tailored for every ride.
Related Shopping Categories
Shop Motor Oil for a 2018 Suzuki RM-Z450 Dirt Bike.
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Shop Oil Drain Pans for a 2018 Suzuki RM-Z450 Dirt Bike.
Shop Tools for a 2018 Suzuki RM-Z450 Dirt Bike.
Shop Oil Fillers and Drain Plugs for a 2018 Suzuki RM-Z450 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.