How to change motorcycle oil and the filter

Changing motorcycle oil and the filter is a 30–45 minute job that costs $40–80 (€35–75) in parts. The sequence: warm the engine, drain the sump, swap the filter, refill to the sight glass or dipstick marks, then re-check the level after a short run. Nothing in it is difficult. The two ways to get it wrong are torque and oil level, and both are avoidable.

What you need

Item	Typical cost	Notes
Oil, 2–4 litres	$25–50 (€23–47)	Manual's viscosity, JASO MA/MA2
Oil filter	$8–15 (€7–14)	OEM or a known brand
Crush washer	$1–3 (€1–3)	New one every change
Drain pan	$10 (€9)	5-litre capacity or more
Torque wrench	$30–60 (€28–56)	One-time buy, pays for itself

The oil itself needs two things right: the viscosity your manual specifies — 10W-40 covers a large share of bikes — and a JASO MA or MA2 rating so the wet clutch grips. Car oil with friction modifiers can make a motorcycle clutch slip. What all the codes mean, and when synthetic earns its price, is in motorcycle oil explained. Depending on where the filter sits, a filter wrench or socket-style cup may be the one extra tool worth buying.

Filters come in two forms, and the box or the manual tells you which you have. Spin-on canisters are the simple case the steps below describe. Cartridge filters live inside a housing with its own cover, an O-ring and a specified torque: the job is the same, but replace the cover O-ring if the kit includes one, and tighten the cover bolts evenly to the manual's figure — the housings are aluminium and crack when muscled.

The job, step by step

One caution before the list: warm means warm, not hot. Five minutes from cold is enough to thin the oil. After a real ride the oil is at full operating temperature and will scald your fingers at the drain plug — give a fully hot engine twenty minutes before opening the sump.

1. Warm the engine for five minutes. Warm oil drains faster and carries the suspended dirt out with it.
2. Switch off. Get the bike upright and level — a paddock or centre stand — with the pan under the drain plug.
3. Remove the drain plug with a proper socket or ring spanner, not an adjustable. Let it drain for a good ten minutes; the last slow dribble is the dirtiest oil in the engine.
4. Remove the old filter. More oil comes with it, so shift the pan first.
5. Wipe the filter seat clean and confirm the old gasket came off with the filter. Smear fresh oil on the new filter's gasket, then spin it on hand-tight plus a quarter turn.
6. Fit the drain plug with a new crush washer and torque it to the manual's figure — typically in the region of 20–30 Nm.
7. Refill with the quantity the manual lists for an oil-and-filter change, checking the sight glass or dipstick as you approach it.
8. Start the engine for two to three minutes. Watch the plug and filter for leaks. Switch off, let it settle a few minutes, then top up to between the marks.

Total elapsed time, including the ten-minute drain: 30–45 minutes. The second time you do it, closer to 30.

Torque is most of the skill

The drain plug threads into an aluminium case, and aluminium threads strip long before steel ones complain. A stripped sump thread turns a $50 (€47) service into a helicoil job or a new case cover. This is why the torque wrench is on the list: the correct figure feels surprisingly gentle — snug, then stop — and hands calibrated on car wheel nuts routinely overshoot it.

The crush washer is the other half of the same lesson. It seals by deforming, which is why it works at low torque and why it needs replacing every change — a reused washer seeps, and the usual response to seeping is tightening the plug harder, which is how threads die.

The filter needs even less: hand-tight plus a quarter turn seals it. A filter cranked on with a wrench is the one you will be stabbing with a screwdriver to remove next time.

Mistakes that cause damage

Overfilling is the common one. Excess oil gets whipped into the crankcase breather and pushed into the airbox, where it soaks the filter and can smoke on the next ride. Fill to the manual's quantity, then trust the sight glass, and only ever read it with the bike upright — a side-stand reading lies low and invites topping up oil that is not missing. Reading it seconds after shutdown lies the other way, because oil is still draining down from the top end; give it a few minutes. The full method is in how to check motorcycle oil level.

The double gasket is the sneaky one. If the old filter's gasket stays stuck to the engine and the new filter goes on over it, the joint holds just long enough to fail at speed and dump the oil. Always check the old filter has its gasket attached.

And the classic: draining the oil, getting distracted, and starting the engine before refilling. It happens to careful people. Park the filler cap on the seat or the throttle grip the moment the drain plug comes out, and it cannot happen to you.

Dispose, then write it down

Used oil goes back into the empty bottles or a sealed container and off to an auto parts store or council recycling point — most take it free. It never goes in a drain or the household bin, and the old filter usually goes to the same place.

Then the thirty seconds that make the next change easier: log the date, odometer reading, oil brand and grade, and filter part number in your maintenance log. Next time there is no guessing which filter fits or when the change happened — and knowing when the next one is due is exactly the arithmetic covered in how often to change motorcycle oil.