The Mazda CX-5 uses a cartridge-style oil filter mounted on top of the engine

The oil filter on a Mazda CX-5 sits in a plastic housing on the top of the engine, not on the side like older vehicles. You access it by removing a large plastic cap — not by unscrewing a traditional spin-on filter from underneath. This design is common on modern Mazdas and means you'll need a filter wrench sized for the cap, not a standard oil filter socket.

The cartridge filter itself is a flat, pleated element that slides into the housing. When you replace it, you're removing the old element and cap together, then installing a new element and either reusing the cap or replacing it if it's damaged. This matters because a leaking cap is one of the most common reasons for oil seepage on CX-5s.

Mazda's maintenance schedule calls for an oil and filter change every 10,000 miles or 12 months, whichever comes first. Some owners with synthetic oil and newer model years may see intervals of up to 10,000 miles, but checking your owner's manual for your specific year is the only way to know for certain.

Key Takeaways

  • The CX-5 oil filter is a cartridge element in a plastic housing on top of the engine, not a spin-on filter underneath.
  • You will need a cartridge filter wrench (typically 74mm or 86mm depending on model year) to remove the cap; a standard oil filter socket will not fit.
  • Replacement involves draining the old oil, removing the cap with the wrench, replacing the filter element, and installing a new or reused cap with a fresh O-ring.
  • The correct filter part number varies by model year and engine type, so confirm yours before purchasing to avoid buying the wrong size.

Filter part numbers and sizes by model year

Mazda CX-5 models from 2013 onward use the cartridge-style filter, but the size and part number change depending on the engine and generation. The 2013–2016 models with the 2.0L or 2.5L engine typically use a different filter than the 2017–2024 generation.

For 2013–2016 CX-5s, the OEM part number is usually PE01-14-300 or PE01-14-300A. For 2017 and newer, Mazda part number PE01-14-300C is more common, though some 2017–2019 models may use PE01-14-300B. The wrench size also differs: earlier models often need a 74mm wrench, while newer ones may require an 86mm wrench.

Aftermarket filters from Fram, Mobil 1, Bosch, and Mann are widely available and fit the same housing. Cross-reference the OEM part number with the aftermarket brand's catalog to confirm the correct size before you buy. Buying the wrong size means the cap won't thread on properly or the element won't seat in the housing.

Tools and supplies you'll need

To replace the filter yourself, you'll need an oil drain pan, a cartridge filter wrench (74mm or 86mm depending on your model year), a new filter element, a replacement O-ring or gasket seal, fresh engine oil, and an oil filter disposal container or bag. Many auto parts stores will recycle used oil and filters for free or a small fee.

A jack and jack stands are necessary if you need to access the drain plug from underneath, though some CX-5 owners can reach it without lifting the vehicle depending on ground clearance and body size. Ramps are a safer alternative to a jack for this job. Have old rags or paper towels on hand — the housing cap and element will drip oil when you remove them.

If you're reusing the plastic cap, inspect it for cracks or damage before reinstalling. A cracked cap is a common source of oil leaks and will need replacement. Mazda sells replacement caps separately if yours is damaged.

Step-by-step replacement process

Start by warming the engine for a minute or two — warm oil drains faster and more completely. Turn off the engine and let it cool just enough to touch safely. Locate the drain plug on the underside of the engine pan and remove it with the appropriate wrench, letting the old oil drain into your pan. This step is part of an oil change, not just a filter swap, so plan for both.

Once the oil has drained, locate the filter housing cap on top of the engine. Use your cartridge filter wrench to turn the cap counterclockwise and remove it. The old filter element will come out with the cap. Carefully pour any remaining oil from the housing into your drain pan. Inspect the inside of the housing for debris or metal particles; if you see any, the engine may have internal wear and you should have it inspected.

Remove the old O-ring or rubber gasket from the cap and replace it with a new one. Mazda includes a replacement O-ring with most OEM filters, or you can buy them separately. Install the new filter element into the housing, making sure it seats fully at the bottom. Thread the cap back on by hand first, then tighten it with the wrench — snug but not over-tight, as the plastic housing can crack if you force it.

Reinstall the drain plug and tighten it to the torque specification in your owner's manual, typically 25–29 foot-pounds for CX-5s. Add the correct amount and type of fresh oil through the filler cap on top of the engine. Check the dipstick or use the electronic oil level monitor in the instrument cluster to confirm the level is correct. Start the engine and let it run for 30 seconds, then turn it off and wait a minute before checking the level again.

Common mistakes and how to avoid them

The most frequent error is buying the wrong filter size or wrench size. CX-5 owners often order a spin-on filter by mistake, then discover it won't fit the cartridge housing. Always confirm your model year and engine size before ordering, and verify the part number matches your vehicle's specification sheet.

Forgetting to replace the O-ring is another common problem. A worn or missing O-ring will cause oil to leak from the cap, sometimes slowly enough that you don't notice until the oil level drops significantly. The O-ring is inexpensive and takes 10 seconds to replace, so there's no reason to skip it.

Over-tightening the cap is a third mistake. The plastic housing is not as strong as a traditional metal filter block, and forcing the cap too hard can crack it. Hand-tighten first, then use the wrench to snug it down — you should feel resistance, but not have to strain.

When to replace the cap instead of reusing it

The plastic cap can be reused many times if it's in good condition, but inspect it every time you change the filter. Look for cracks, warping, or damage to the threads. If the cap is cracked or the threads are stripped, you must replace it — reusing a damaged cap will cause oil leaks.

If you've had an oil leak from the housing area in the past, the cap may be the culprit. A new cap with a fresh O-ring often solves the problem. Mazda replacement caps are available from dealerships or online retailers and cost between $15 and $30 depending on the model year.

Frequently Asked Questions

Can I use any cartridge filter, or does it have to be Mazda brand?

Aftermarket filters from Fram, Bosch, Mobil 1, and Mann fit the same housing and meet the same performance standards. The key is matching the size and part number to your model year and engine. OEM Mazda filters are often more expensive but are may provide to fit; aftermarket options are usually cheaper and work just as well if you buy the correct size.

What size wrench do I need for my CX-5?

Most 2013–2016 CX-5s use a 74mm wrench, while 2017 and newer typically need an 86mm wrench. Check your owner's manual or the filter housing itself — the size is often printed on the cap. If you're unsure, bring your vehicle to an auto parts store and they can tell you which wrench fits.

How often should I replace the filter?

Mazda recommends changing the oil and filter every 10,000 miles or 12 months, whichever comes first. If you drive in severe conditions — frequent short trips, towing, or dusty environments — you may need to change it more often. Your owner's manual has a maintenance schedule specific to your driving conditions.

What should I do if the cap is cracked?

Stop using the vehicle until you replace the cap. A cracked cap will leak oil, and continuing to drive will lower the oil level and risk engine damage. Replacement caps are inexpensive and available from Mazda dealerships or online retailers. Installation takes less than five minutes.

Can I change just the filter without changing the oil?

Technically yes, but it's not recommended. The filter and oil work together to keep the engine clean, and changing one without the other defeats the purpose. Mazda's maintenance schedule calls for both to be changed at the same time, and following that schedule is the best way to keep your engine healthy.