Spin On or Cartridge, How the Filter Changes the Job

There are two oil filter architectures and they are different jobs. A spin on is a sealed steel can with its own rubber gasket that threads onto the engine and is thrown away whole. A cartridge is a paper element that drops into a housing on the engine, and the housing, the cover, the spring and the O rings all stay with the bike. Which one you have decides what you handle, what you can accidentally leave behind, and where the leak comes from afterwards.

Difficulty	Time	DIY cost	Tools	Safety
Straightforward, with two mistakes that matter	Part of an oil change, not a job on its own	A filter, and the seal kit if yours is a cartridge	Drain pan, filter tool or correct socket, funnel, nitrile gloves	Hot oil, hot exhaust, the bike falling, used oil handling

No torque figures appear on this page. The tightening instruction for a spin on filter is normally printed on the filter itself, and the cover torque for a cartridge housing is in the service manual. Those are the two places that govern.

Before you touch anything

• Hot oil and a hot exhaust. A filter is full of oil, and breaking its seal releases that oil along your forearm. Filters are frequently mounted high on the engine or facing downward, so the release can travel back toward your face as readily as toward the pan. Let the engine come off operating temperature first, and remember that headers and mufflers stay hot long after the cases feel touchable.

• Fire. A filter emptying onto a hot header smokes and can catch. Trace the path the oil will take before the seal breaks, and wipe the pipes down before the engine is started again.

• The bike falling. A tight filter sits somewhere awkward and invites you to brace against the machine while you pull on it. Level ground, a proper stand or lift, and nothing that can shift under load.

• Used oil on your skin. The US Environmental Protection Agency states that used motor oil is insoluble, persistent, and can contain toxic chemicals and heavy metals. Wear eye protection and nitrile gloves. An overhead or inverted mounting puts the release near eye level, which is why the eye protection is not optional on this job. Wash afterwards. EPA does not publish a specific human health outcome from skin contact on its used oil pages, so we do not claim one either. Read the EPA used oil guidance.

• Enclosed spaces. Never run an engine in a closed garage, and the idle and leak check at the end of this job counts as running it.

The two architectures

A spin on filter is a disposable assembly. The element and the valve arrangement are sealed inside a steel can, and a rubber gasket sits in a groove around the open end. The can threads onto a stub on the engine and the gasket squashes against a flat machined face. Everything you need comes in the box, and everything you remove leaves with the old filter. One seal, one thread, one decision about how tight.

A cartridge filter is the opposite trade. Only the paper element is consumable. The housing is part of the engine, the cover bolts on, and between them live a spring, one or more end caps or seats, and one or more O rings. You are not fitting a sealed unit, you are reassembling a small mechanism. There are more parts, they have an orientation, and several of them do not come in the box.

That difference is the whole point of this page. A spin on goes wrong at the gasket. A cartridge goes wrong at the seals and the reassembly.

Spin on, where the gasket is the whole job

Oil the seal before you fit it. Wipe a film of clean engine oil around the new gasket. A dry rubber gasket can grab the mating face as the filter turns, and roll or tear as it goes, which gives you a seal that looks fitted and is not. An oiled gasket slides and seats evenly.

Wipe the mating face. The engine's sealing surface should be clean and dry of grit before the new filter touches it.

Then the check that matters more than all the others. Look at the old filter you just removed and confirm that its gasket came off with it. If the old gasket stayed stuck to the engine and you thread a new filter over it, you now have two gaskets stacked in one groove. That is not a weep, it is a large leak under oil pressure, and it usually appears within minutes of starting. Run a finger all the way around the sealing face before the new filter goes anywhere near it.

Tightening. Turn it on by hand until the gasket makes contact with the seat, then tighten by the further amount the instruction specifies. That instruction is normally printed on the filter can itself, and your manual gives the machine's own requirement. Use those rather than a figure from anywhere else, because the gasket and the seat are properties of the parts in front of you. Use a wrench only to reach the turn the instruction specifies, never to add feel-based tightness beyond it.

Cartridge, where the parts that stay behind are the risk

The cover comes off with its bolts, and what is behind it varies by machine. Before you disturb anything, photograph it. That photograph is worth more than any description here, because it is your engine rather than a generic one.

Take the parts out and lay them on the bench in the order they came off, the same way up. Elements, seats and springs are frequently not symmetrical, and an element fitted upside down can seal against the wrong surface and let oil bypass the medium entirely.

Now count the seals. This is the cartridge equivalent of the double gasket, and it catches experienced people. The cover O ring lives in a groove. It can come off with the cover, stay in the groove, or drop into the housing where you will not see it. If you fit a new O ring while an old one is still in there, you get a leak that is genuinely difficult to trace, because everything looks correctly assembled from outside. Count the seals out and count them into the bin. If the kit contains three seals, three seals should have come off the bike.

Lubricate the new O rings with clean engine oil before fitting, for the same reason as the spin on gasket. Then fit the element the way your photograph shows, refit the cover, and tighten the bolts evenly to the manual's torque. Cover bolts are usually small and they usually thread into aluminium, so this is a place where more is emphatically not better.

Pre-filling the filter, argued honestly

The practice is to fill the new filter with clean oil before fitting it, so the engine reaches full oil pressure sooner on the first start.

Whether you can do it at all depends on how the filter is mounted. On a filter that sits with its opening upward, the oil stays where you put it. On a horizontally mounted or inverted filter it runs straight back out as you offer it up, so you finish with oil on the frame and on the floor and very little in the filter. That part is not a debating point, it is geometry.

Beyond that, the honest position is this. There are arguments made on both sides, including a concern about introducing oil to the wrong side of the filter medium on some designs, and we have not found a primary source that settles the question with evidence. So we are not going to pretend to. The instruction that governs is the one from the maker of your machine and the maker of your filter. If either tells you to pre-fill, pre-fill. If neither says anything, fitting it dry and letting the engine build pressure at idle is the conservative choice, and it is the choice that assumes nothing your documentation did not tell you.

What everybody agrees on is the step afterwards, and it is the one that actually protects the engine. Start the engine and let it idle. Watch the oil pressure warning light go out, or the gauge come up. Stop, look around the filter for leaks, and recheck the oil level, because the filter has now taken its share and the level will have moved. That sequence costs nothing and catches almost every mistake on this page.

Specifications you need to look up for your bike

Value	Why you need it	Where to find it
Which filter architecture your machine uses	It decides the whole procedure	Owner's manual and factory service manual
Filter part number, and the seals included with it	Buying the right kit before you open anything	Owner's manual and the parts catalogue
Tightening instruction for a spin on filter	Sealing without crushing the can	Printed on the filter, and in the manual
Cartridge cover bolt torque and tightening pattern	Not stripping aluminium, and sealing evenly	Factory service manual
Number and location of every O ring in the housing	Counting them out and counting them in	Factory service manual
Element orientation inside the housing	An upside down element can let oil bypass the medium	Factory service manual
Whether the maker tells you to pre-fill the filter	It is the only instruction that settles the argument	Owner's manual and the filter instructions
Oil quantity for a change with a filter, as opposed to without	The filter takes its share	Owner's manual
Filter change interval for your model and use	Knowing when to do this again	Owner's manual

When to stop and take it to a shop

Stop if a spin on filter will not come off and you have already deformed the can, because a crushed filter is harder to grip, not easier. Stop if the threaded stub the filter screws onto turns or feels loose, since that is an engine fixing rather than a filter problem. Stop if a cartridge cover bolt strips or a bolt head rounds off, and do not keep going with a larger tool. Stop if the oil pressure warning does not go out promptly at idle after a filter change, and do not rev the engine to see whether it clears. And stop if a leak persists once you have confirmed a single correctly seated seal, because that points to a damaged sealing face rather than an assembly error.

Related checks

• Dry sump oil changes, and why the oil is not in the engine

• Engine, primary and transmission, the three fluid change

• How to change motorcycle oil

Frequently asked questions

How tight should an oil filter be?

As tight as the instruction that came with it says, and no tighter. On a spin on that instruction is normally printed on the can, expressed as hand tight to contact plus a further specified amount. Your service manual gives the figure your machine's maker requires. We do not publish a number, because the correct amount depends on the gasket and seat of the parts in front of you, and a wrong figure either leaks or crushes a can onto the engine.

Do I need to pre-fill the oil filter?

Only if the maker of your machine or the maker of the filter says to. On a vertically mounted filter it is possible and many people do it. On a horizontal or inverted mounting it mostly ends up on the floor. We have no primary source establishing a measurable difference either way, so we follow the instruction rather than the habit, and we always do the idle and leak check afterwards.

Why is my bike leaking after an oil filter change?

Work through the assembly errors first. On a spin on, the usual cause is the old gasket left stuck to the engine with the new one squashed on top of it. On a cartridge, it is an old O ring still in the groove or lying in the housing, or a cover tightened unevenly. A dry seal that rolled on fitting is the third. All three look correct from outside.

Can I reuse the O rings in a cartridge housing?

Not as a matter of course. If your filter kit includes new seals, that is the maker telling you those seals are consumable, and old rings take a set in the groove and do not recover. Where a seal is intended to be reused, the service manual says so.

What do I do with the old filter?

Drain it and recycle it. EPA states that used oil filters can usually be dropped off at the same collection centres that take used oil, that they contain reusable scrap metal, and that if properly drained they can be safely recycled or disposed. Keep the oil out of the ground and out of the drain.

About this guide

Published by MotoGearRater. Universal procedure only, with no model-specific specifications. This guide has not been reviewed by a qualified motorcycle technician, and we say so rather than implying a review that has not happened. Read our editorial standards.