Oil Changes (and What It Tells You About Your Engine)

Tools Needed: Socket wrench, oil filter wrench, drain pan, funnel, rags, torque wrench (recommended)
Estimated Time: 30-45 minutes for your first one, 20 minutes once you know what you're doing
Difficulty Level: ★★☆☆☆ (Easy)

Oil changes are the foundation of motorcycle maintenance. They're straightforward, require minimal tools, and save you significant money over the life of your bike. More importantly, what comes out of your drain pan tells you about your engine's health. Dark oil is normal. Milky oil means trouble. Metallic flakes mean serious trouble.

This is the first post in the Hands-On Maintenance section. We're done just looking at things - now we're actually doing the work. If you can change your oil, you can handle most basic maintenance tasks. Let's get started.

What You'll Need

Tools:

• Socket or wrench to fit your drain plug (varies by bike)
• Oil filter wrench if you have a spin-on filter (Check your filter; some spin-on filters are designed to be removed with a wrench or socket instead of a special filter wrench.)
• Drain pan that holds at least your engine's oil capacity, plus a bit extra
• Funnel for pouring oil
• Torque wrench (recommended but not absolutely required)
• Rags or shop towels

Materials:

• Engine oil (check your manual for type and quantity)
• Oil filter
• New drain plug crush washer or o-ring (varies by bike)
• Gloves if you don't like getting oil on your hands

Optional but useful:

• Rear stand or center stand to level the bike
• Cardboard or newspaper under your work area
• Parts tray for small hardware

Choosing Oil and Filters

We covered oil types in the Fluids posts. Quick recap: use the viscosity and rating specified in your manual (typically 10W-40 or 20W-50, JASO MA or MA2 for wet clutches). Conventional oil works fine if you change it on schedule. Synthetic costs more, lasts longer, and offers better protection in demanding conditions.

Oil quantity: Your manual tells you how much oil the engine holds. There are usually two capacities listed - oil change capacity (with filter) and total capacity (completely dry engine). You want the oil change capacity. Most bikes take 2.5-4 quarts. Many bike also have the total oil capacity cast into the engine case, usually near the dipstick or sight glass.

Oil filters: There are four main types:

Spin-on filters look like the filters on cars - a metal canister that screws onto the engine. These are the easiest to change. Unscrew the old one, screw on the new one, done.

Cartridge filters have a replaceable paper element inside a housing that's part of the engine. You remove a cover, pull out the old element, insert a new one, replace the cover. You'll usually replace an o-ring or two in the process.

Canister filters are similar to cartridge filters but the housing is removable. You unscrew the canister, replace the element and o-rings inside, and screw it back on.

Screen filters are usually found on very small displacement bikes. Just like it sounds, it is a metal screen inside a plastic framework that traps larger bits of debris. Screen filters are designed to be cleaned and reinstalled.

Use the filter specified in your manual or an equivalent from a reputable manufacturer. Don't cheap out on filters - a $5 filter that fails can destroy a $5,000 engine.

The Process: Step by Step

Preparation

Warm up your engine for a few minutes. Warm oil flows better and carries more contaminants out with it. Don't run it until it's fully hot - just warm enough that the oil flows freely. If you just finished a ride, let the bike cool for 10-15 minutes so you're not working with scalding oil.

Put the bike on the center stand or a rear stand so it's level. If you only have the sidestand, that works, but depending on where the drain plug is located on the engine case, you might not get quite as much oil out.

Locate your drain plug (look on the bottom of the engine, or on the side near the bottom) and oil filter. Look at your manual if you're not sure where they are. Some bikes have multiple drain plugs in different spots, or a secondary drain plug that can only be accessed by removing another drain plug. Some have a separate plug for the oil screen or strainer.

Put your drain pan under the drain plug, positioned to catch the oil as it comes out. Oil doesn't always drain straight down - it often shoots out at an angle initially. Position the drain pan accordingly, and be ready to move it quickly if necessary.

Draining the Oil

Loosen the drain plug with your socket or wrench. Once it's loose, finish unscrewing it by hand while maintaining upward pressure. As you remove the last thread, pull it away quickly so you don't drop it in the drain pan. The oil will start flowing immediately.

Once you’ve figured out your oil’s trajectory, remove the oil filler cap or dipstick. This lets air into the system so oil drains faster and more completely. Leaving the filler cap or dipstick in initially slows the oil’s flow just a bit, which makes it less likely to overshoot or splash out of the drain pan.

Let it drain for at least 10 minutes. Some people rock the bike side to side to get the last bit out. You won't get 100% of the old oil out, but you'll get most of it.

What to look for in your drain pan:

Normal oil is dark brown or black. That's what used oil looks like. The darker it is, the longer it's been since your last change. Dark alone doesn't mean trouble, especially if your oil had a dark color (purple, blue) when it was new.

Milky or foamy oil means water or coolant contamination. This is serious. You have a head gasket leak, a cracked case, or water got into your oil somehow (pressure washer through the breather, for example). Don't just change the oil and ignore this - find the source of contamination.

Metallic flakes or glitter means metal is coming from somewhere inside your engine. A very light metallic sheen in the first oil change after break-in is normal. Large flakes, chunks, or glitter after break-in means wear - bearings, cam lobes, cylinder walls. This is cause for concern and should be investigated.

Fuel smell means gasoline is getting into your oil. On carbureted bikes, stuck float valves are the usual culprit. On fuel-injected bikes, leaking injectors or failed fuel pressure regulator. Fuel dilutes oil and ruins its lubricating properties. Higher quantities of fuel contamination will increase the overall quantity of fluid in the crankcase, making the bike difficult to start. Find the leak and fix it.

Lots of fine debris without obvious metal chunks might be clutch material (if you have a wet clutch) or carbon deposits. Wipe up some of the debris and roll it between your gloved fingers, if it spreads around like clay or paint, it’s likely to be carbon or clutch material. A small amount is normal. Excessive amounts suggest clutch wear or combustion problems.

Save a small sample of your drain oil in a clear container if you see anything unusual. This makes it easier to show a mechanic or compare with future oil changes. It’s also possible to find a facility that can test your oil sample and give you deeper insight into the healthy of your engine.

Installing the Drain Plug

While the oil drains, inspect your drain plug and crush washer (or o-ring, depending on your bike). The crush washer is a soft metal ring that deforms slightly when you tighten the plug, creating a seal. These should be replaced every oil change - they're cheap. Reusing old crush washers can lead to leaks.

Some bikes use an o-ring instead of a crush washer. These can often be reused a few times if they're still soft and pliable. Replace them if they're hard, cracked, or deformed.

Make sure the threads on the drain plug and in the case are clean. Wipe them with a rag. Look for damage to the threads - if they're stripped, you have a bigger problem that needs addressing before you button things up.

Install the new crush washer or o-ring on the drain plug. Thread the plug in as far as possible by hand to make sure it's not cross-threaded. Tighten it snug with your wrench.

How tight? Your manual specifies a torque value, usually somewhere around 20-30 ft-lbs for most bikes. If you have a torque wrench, use it. If you don't, tighten the plug firmly but not gorilla-tight. The crush washer does the sealing, not brute force. Cross-threading the plug or stripping the threads in your engine case is expensive to fix. Snug is good. Barely tight enough to stop a leak is too loose. Tight enough to deform the threads is too tight. You'll develop a feel for it, especially if you have access to a torque wrench the first few times so you know how proper torque feels.

Changing the Filter

Spin-on filters: Use the appropriate tool – wrench, socket wrench, or oil filter wrench - to loosen the old filter. It'll be tight. Once loose, unscrew it by hand. Oil will drain out of the filter and the bike, so have a rag or pan ready. Be sure the old gasket didn’t stay stuck to the engine. Wipe clean the mounting surface on the engine.

Fill the oil filter with fresh oil; let it absorb into the filter element for a minute, then add a bit more. It doesn’t need to be full to the top, and this step isn’t technically critical, but it is a good habit to be in. “Priming” your oil filter limits the amount of time that your engine is running dry before the lubrication system is pressurized and flowing as designed. It may sound like a small thing, but much of your engine wear and tear happens in the first few seconds after start-up after an oil change; priming the filter gives it a bit of a head start.

Take a little fresh oil and rub it lightly on the rubber gasket of the new filter. This helps it seal and makes it easier to remove next time. Thread the new filter on by hand until the gasket contacts the mounting surface, then tighten it an additional 3/4 to 1 full turn by hand. Don't use the filter wrench to tighten it - hand tight is sufficient.

Cartridge filters: Remove the cover bolts and pull off the cover. The filter element pulls straight out. Sometimes there's a spring or other parts - pay attention to the order and direction of those parts. Clean the sealing surface and replace any o-rings – cartridge type filters often come with new o-rings, but not always. Install the new element and replace the cover, then torque the bolts to spec.

Canister filters: Similar process to cartridge filters but the entire housing unscrews. Remove it, replace the element and o-rings inside, then reinstall the canister.

Make sure all old o-rings/gaskets are removed, and the new o-rings are seated properly and not pinched. A pinched o-ring will leak.

Adding Fresh Oil

Make sure your funnel is clean, then put it in the oil fill hole. Pour in slightly less oil than the amount of specified in your manual for oil changes (1/4-1/2 liter is usually sufficient). Then check the level as outlined in your owners manual, and add more as needed.

How you check the level depends on your bike - some want the bike level, some want it on the sidestand. Some want the dipstick screwed in, some don't. Follow your manual's procedure.

Add oil until you're at the proper level - usually somewhere between the MIN and MAX marks. Don't overfill. Too much oil can cause starting problems, blow out seals, and create excess crankcase pressure.

Starting and Checking for Leaks

Put the oil filler cap back on. Start the bike and let it idle for a minute. Watch for leaks at the drain plug and filter. The oil pressure light (if you have one) should go out within a few seconds.

If you see a leak, shut the bike off immediately and address it. Drain plug leaks usually mean the crush washer isn't seated or the plug isn't tight enough. Filter leaks mean the o-ring isn't seated, the filter isn't tight enough, you forgot to oil the gasket, or the old gasket stayed stuck to the engine when you removed the old filter.

Shut the bike off and let it sit for a few minutes, then check the oil level again. It will have dropped slightly as oil fills the filter and oil passages. Top off if needed. Take the bike for a short ride, then recheck for leaks and verify the oil level is correct. You're done.

Common Mistakes

Over-tightening the drain plug. This strips threads. If you strip the threads in your engine case, you need a thread repair or an oversize drain plug. Both are annoying to deal with. Snug is sufficient.

Forgetting to replace the crush washer. Old crush washers leak. New crush washers are cheap. Use a new one every time.

Over-tightening the oil filter. Hand tight is correct for spin-on filters. Over-tightening makes them hard to remove next time and can damage the gasket or filter housing.

Adding too much oil. Check your level as you fill. Overfilling causes problems.

Not running the engine before checking the final level. Run the engine to circulate oil through the system, then check your level. Otherwise you'll likely end up low.

Using the wrong oil. Use the viscosity and rating specified in your manual. Don't use automotive oil, especially in a bike with a wet clutch.

Disposing of old oil improperly. Used oil is hazardous waste. We'll cover proper disposal next.

Oil Disposal

Don't pour used oil down the drain, into the ground, or into the trash. It's illegal, it's terrible for the environment, and it contaminates water supplies.

Be mindful of the used oil disposal options in your area. Auto parts stores often accept used oil for free. Many quick-lube shops do too. Some cities have hazardous waste collection centers. Pour your used oil into a sealed container (the empty oil bottles work perfectly) and take it to a collection point.

In many places, used oil filters can go in the trash once they are thoroughly drained, but check your local regulations. Some areas want them recycled separately.

When Something Goes Wrong

Oil pressure light stays on: Shut the bike off immediately. Check your oil level - if you're low, add oil. If the level is correct, you might have a failed oil pump, clogged pickup screen, or other serious problem. Don't run the engine until you figure it out.

Leak at the drain plug: Tighten the plug slightly. If it still leaks, you may need to replace the crush washer again or check for damage to the sealing surface.

Leak at the filter: Check that the old filter gasket didn't stick to the mounting surface when you removed the old filter. Sometimes they do. If you installed the new filter with the old gasket still stuck to the engine, it will leak. Remove the new filter, remove the old gasket, clean the surface, and reinstall the filter.

Engine sounds different after the oil change: Some valve noise is normal for a few seconds as oil circulates. If the noise persists or gets worse, shut the bike off and investigate. You might have used the wrong oil viscosity. In bikes with separate oils with multiple drain plugs, you may have drained and/or filled in the wrong location.

Oil level keeps dropping: You have a leak or the engine is burning oil. Find the leak and fix it. If you're burning oil (blue smoke from the exhaust), you have piston ring or valve guide wear.

How Often Should You Change Oil?

Follow your manual's recommendation. Typical intervals are 3,000-5,000 miles for conventional oil, 5,000-8,000 miles for synthetic. Some newer bikes with synthetic oil can go longer, but check your specific manual.

Change your oil more frequently if you:

• Ride in dusty or dirty conditions
• Do lots of short trips where the engine never fully warms up
• Ride hard (track days, aggressive riding)
• Ride in very hot or very cold conditions

Even if you don't hit the mileage interval, change conventional oil at least once a year. Unlike synthetic oil, conventional oil degrades from sitting, condensation accumulates, and additives break down.

Common Questions

"Do I really need to change the filter every time?"

Yes. Filters are cheap. Engines are expensive. The filter is full of the contaminants you just drained out. Replace it.

"Can I reuse the crush washer?"

I don't recommend it. They’re cheap, and reusing them risks leaks. If your drain plug leaks after an oil change and you need to pull it to install a new crush washer, it’s going to cost you way more money in lost oil than it would have cost you to use a new crush washer to begin with. Use a new one every time.

"My oil is black after only 1,000 miles. Is that bad?"

No. Oil darkens quickly - that's normal. You will never get 100% of the old oil drained during a standard oil change, so that bit of old oil will mix with the new oil and make it look noticeably darker. The oil is carrying contaminants in suspension, which is exactly what it's supposed to do. Dark oil isn't a problem. Contaminated oil (milky, metallic, fuel smell) is a problem.

"How long can I let used oil sit before disposing of it?"

As long as it's in a sealed container, months or even years is fine. But get in the habit of disposing of it right away. Oil collection points are usually on your way to somewhere else.

"Can I mix different brands or types of oil?"

In an emergency on the road, yes - it's better to add whatever oil you can find than to run low. For regular oil changes, stick with one brand and type. Different manufacturers use different additive packages. Mixing them occasionally won't hurt, but it's not ideal.

"Should I use the same oil year-round or change viscosity with the seasons?"

If your manual shows different viscosities for different temperature ranges, follow that. If it specifies one viscosity, use that year-round. Modern multi-weight oils handle a wide temperature range.

"How do I know if I stripped my drain plug threads?"

The plug won't tighten properly - it turns and turns without getting snug. Or it leaks no matter how tight you get it. If you suspect stripped threads, stop and have a shop look at it. Continuing to ride with stripped threads will make the problem worse.

What You've Learned

You can now change your own oil and filter - the single most important maintenance task you'll perform. You know what to look for in your drain pan to spot problems early. You know the common mistakes and how to avoid them. You understand proper disposal and when something requires further investigation.

Oil changes are the gateway to more complex maintenance. If you can drain oil, replace a filter, and refill correctly, you can handle brake pad replacement, chain adjustment, and other routine maintenance. The fundamental skills are the same: follow the procedure, pay attention to torque specs, look for problems, and don't force things.

In the next post, we'll tackle another common hands-on task: battery maintenance and replacement. We'll cover testing, charging, the difference between battery types, and how to avoid the common mistakes that kill batteries prematurely.

Coming Up Next: Battery Maintenance: Testing, Charging, and Replacement