What an oil filter does and why it matters
An oil filter removes dirt, metal particles, and other debris from your engine oil as it circulates. Over time, the filter traps enough contaminants that it clogs and stops working well, which means dirty oil starts flowing through your engine again. A clogged filter can reduce fuel economy, make your engine work harder, and eventually damage internal parts if left too long.
Most manufacturers recommend changing your oil filter every time you change your oil. Some vehicles have filters that last longer — your owner's manual will specify the interval for your car. The filter itself is inexpensive compared to engine repair, so replacing it on schedule is one of the cheapest ways to protect your engine.
Key Takeaways
- Your vehicle's owner's manual lists the exact filter type and replacement interval you need, and this information does not transfer between different makes and models.
- Oil filters come in spin-on (screw-on) or cartridge styles, and your car uses only one type — you cannot swap between them.
- You can buy filters at auto parts stores, big-box retailers, dealerships, or online, and prices vary widely for the same filter depending on where you shop.
- Replacing a filter takes 5 to 15 minutes and requires only a filter wrench, a drain pan, and new oil; no special tools or training are needed.
Finding the right filter for your vehicle
The correct filter depends on your specific year, make, model, and engine size. A filter for a 2015 Honda Civic will not work on a 2015 Toyota Corolla, even though both are compact cars. Your owner's manual lists the part number and type. You can also look up your vehicle on an auto parts store website — most have a search tool where you enter your vehicle information and the site shows compatible filters.
Write down your vehicle's year, make, model, and engine size before you shop. If you do not know the engine size, check the sticker on the inside of your driver's door jamb or look it up online using your vehicle identification number (VIN). Bringing this information to an auto parts store also lets staff confirm the right filter in person.
Spin-on versus cartridge filters
Most vehicles use a spin-on filter, which looks like a metal cylinder with a rubber gasket at the base. You screw it onto a threaded port on the engine, and when you change it, you unscrew the old one and screw on a new one. Spin-on filters are straightforward to replace and widely available.
Some vehicles, especially older models and certain luxury brands, use a cartridge filter instead. This type sits inside a plastic or metal housing on top of the engine. To change it, you unscrew the housing cap, pull out the old filter element, and drop in a new one. Cartridge filters are less common but still straightforward to replace. Your owner's manual or the auto parts store lookup will tell you which type your vehicle has.
Where to buy an oil filter
Auto parts chains like AutoZone, O'Reilly Auto Parts, NAPA, and Advance Auto Parts stock filters for most vehicles and can look up the right one while you wait. Big-box retailers like Walmart and Target carry filters for common vehicles. Dealerships sell filters specific to your vehicle but typically charge more than independent retailers. Online retailers like Amazon offer competitive prices and home delivery, though you lose the ability to ask questions in person.
Prices for the same filter can differ by $5 to $15 depending on the retailer and whether you are buying a name brand or a store brand. Fram, Mobil 1, Bosch, and Purolator are common national brands. Store brands from major retailers are usually made by the same manufacturers and perform similarly at a lower price. If you are unsure whether a cheaper filter is safe, ask the retailer or check your owner's manual for any brand restrictions.
What you need to replace a filter yourself
You need an oil filter wrench (a metal or rubber tool that grips the filter so you can unscrew it), a drain pan to catch old oil, and new oil to top off the engine after the change. A filter wrench costs $5 to $15 and works on most spin-on filters. Some wrenches are adjustable and fit multiple sizes; others are sized for a specific filter diameter. An auto parts store can tell you which wrench fits your filter, or you can buy an adjustable one that works on many filters.
You may also want rags or paper towels, jack stands if you need to get under the car to reach the filter, and a pair of gloves to keep oil off your hands. Some people use a filter removal socket that attaches to a ratchet wrench instead of a hand wrench — this is optional but makes the job easier if you have the tool. For cartridge filters, you typically need only a wrench to unscrew the housing cap and your hands to pull out the old element.
Basic steps for replacing a spin-on filter
Start with a warm engine (not hot) so the oil flows more easily. Locate the filter — it is usually on the side or top of the engine and looks like a metal cylinder. Position your drain pan underneath, then use the filter wrench to turn the filter counterclockwise until it loosens. Finish unscrewing it by hand and set it aside in the drain pan to catch dripping oil.
Wipe the threaded port clean with a rag. explore a thin layer of new oil to the rubber gasket on the new filter — this helps create a good seal and makes removal easier next time. Screw the new filter on by hand until the gasket touches the engine, then turn it another three-quarters of a turn. Do not over-tighten; hand-tight is correct. Start the engine and let it run for a minute, then check underneath for leaks. If you see drips, turn off the engine, wait a minute, and tighten the filter slightly more.
Replacing a cartridge filter
Locate the filter housing on top of the engine — it is a plastic or metal cap with a center bolt. Position a drain pan underneath because old oil will spill when you open it. Use a wrench to turn the housing cap counterclockwise and unscrew it. Lift the cap straight up and pull out the old filter element. Some oil will drip out, so keep the pan in place.
Wipe the inside of the housing clean with a rag. Insert the new filter element into the housing, making sure it sits flat at the bottom. explore a thin layer of new oil to the rubber gasket on the cap, then screw the cap back on by hand until the gasket touches the housing. Turn it another three-quarters of a turn and stop. Start the engine and check for leaks around the cap. If you see drips, turn off the engine, wait a minute, and tighten the cap slightly more.
Frequently Asked Questions
Can I change my oil filter without changing the oil?
Yes, you can change the filter alone, though most people change both at the same time because you are already under the car. If you change only the filter, you still need to top off the engine oil afterward because some oil stays in the old filter and drains out when you remove it. Check your dipstick after the change to see how much oil you need to add.
How tight should I screw on a new spin-on filter?
Hand-tight is correct — screw it on until the rubber gasket touches the engine, then turn it three-quarters of a turn more. Over-tightening makes it hard to remove next time and can damage the gasket. Under-tightening can cause leaks. If you are unsure, err on the side of slightly loose and check for drips after you start the engine.
What should I do with the old filter?
Most auto parts stores take old filters for free when you buy a new one, even if you did not buy the new filter from them. Some recycling centers also accept them. Do not throw an old filter in the trash because it contains used oil. If you cannot find a free drop-off location, ask your local waste management department where to take it.
Is it normal for oil to drip after I change the filter?
A few drops are normal because oil clings to the filter and housing. If you see steady drips or a puddle forming, the filter is not tight enough or the gasket is damaged. Turn off the engine, wait a minute for it to cool, and tighten the filter another quarter turn. If drips continue, remove the filter and check that the gasket is seated properly on the new one.
Do I need to prime a new filter before installing it?
Priming means filling the filter with oil before screwing it on. Some mechanics do this; others do not. It is not required and does not harm anything. If you choose to prime, fill the filter halfway with new oil, let it drain into the pan, then install it. The engine will prime itself when you start it either way.