Finding your STP air filter starts with your vehicle's year, make, and model

STP makes air filters for most common vehicles, but the right filter for your car is not the same as the right one for your truck. The easiest way to find yours is to enter your vehicle information into STP's online filter finder tool on their website, which will show you the exact part number you need. You can also call an auto parts store like AutoZone, O'Reilly, or NAPA with your vehicle details, and they will tell you which STP filter fits.

If you already know your vehicle's engine size or have your owner's manual handy, you can search STP's product catalog directly by filter type — engine air filters are listed separately from cabin air filters, and each has its own numbering system. The part number matters because an air filter that is slightly too large or too small will not seal properly in your engine, which defeats the purpose of filtering.

Key Takeaways

  • STP's online filter finder tool on their website is the fastest way to match a filter to your specific vehicle year, make, and model.
  • You can also visit or call any major auto parts retailer with your vehicle information and they will tell you the correct STP part number.
  • Engine air filters and cabin air filters are different products with different part numbers, so confirm which type you need before ordering.
  • Knowing your vehicle's year, make, model, and engine size makes the lookup process take less than five minutes.

Using STP's online filter finder

Go to the STP website and look for their filter finder or product selector tool. You will enter your vehicle's year, make, and model into the search fields. STP will then display all the filters that fit your vehicle, including engine air filters, cabin air filters, and any specialty filters for your engine type.

Once you see the results, click on the engine air filter option to see the part number, dimensions, and a photo of what it looks like. Write down the part number — it usually starts with "SP" or similar — because you will need it when you order or pick up the filter at a store.

Looking up your filter at an auto parts store

If you prefer to look up your filter in person, walk into AutoZone, O'Reilly, NAPA, or Advance Auto Parts with your vehicle's year, make, and model written down. The staff can search their computer system for STP filters that fit your vehicle and show you the options. Many stores also have a physical filter display where you can see the part before you buy it.

Some stores will even install the filter for you for a small fee, or you can take it home and install it yourself. Either way, having the correct part number prevents you from buying the wrong filter and having to return it.

Finding your vehicle information if you do not have it handy

Your vehicle's year, make, and model are printed on your registration card, insurance documents, and the door jamb sticker on the driver's side of your car. The door jamb sticker also lists your engine size, which is helpful if you need to narrow down options. If you have lost these documents, you can also look at your vehicle's VIN (Vehicle Identification Number), which is a 17-character code stamped on the dashboard near the windshield or on your title.

Some auto parts stores can decode your VIN for you if you call or visit with it. You can also use free VIN decoder websites to find your vehicle's exact specifications, though calling a store directly is usually faster and more reliable.

Engine air filters versus cabin air filters

STP makes two different types of filters, and they go in different places. An engine air filter sits in a plastic box under your hood and keeps dust and debris out of your engine. A cabin air filter sits behind your dashboard or under your hood and filters the air that comes into your car's interior through the vents.

Both need to be replaced periodically, but they have different part numbers and different replacement schedules. When you look up your vehicle on STP's website or at a store, make sure you are ordering the right type. Most people replace their engine air filter more often than their cabin air filter.

What to do if you cannot find your filter listed

If STP's finder tool does not show a filter for your vehicle, it is possible that STP does not make a filter for that specific year or model. This is more common with older vehicles or less common makes. In that case, you have two options: call STP's customer service line to confirm they do not make a filter for your vehicle, or visit an auto parts store and ask if they carry STP filters for your car.

If STP does not make a filter for your vehicle, the store can recommend another brand that does. Fram, Bosch, and Motorcraft are other common brands that make filters for a wide range of vehicles. The important thing is getting a filter that fits your vehicle correctly, regardless of the brand.

Frequently Asked Questions

Can I use a different brand of air filter if I cannot find the STP part number?

Yes. What matters is that the filter fits your vehicle correctly, not the brand. If STP does not make a filter for your car, any other brand with the correct part number for your year, make, and model will work. Ask an auto parts store to help you find the right filter from another manufacturer.

Do I need to know my engine size to find the right STP filter?

Not always. If you enter your vehicle's year, make, and model into STP's finder tool, it will show you all the filters that fit, and the tool accounts for different engine sizes automatically. However, having your engine size on hand can speed up the process if you are calling a store or searching manually.

Where can I buy STP air filters?

STP filters are sold at most major auto parts retailers, including AutoZone, O'Reilly, NAPA, Advance Auto Parts, and Walmart. You can also order them online from these retailers or from STP's website. Prices vary by location and retailer, so it is worth calling a few stores if you want to compare.

How often should I replace my STP air filter?

Engine air filters typically need replacement every 15,000 to 30,000 miles, depending on driving conditions and how dusty your area is. Cabin air filters usually last 12,000 to 15,000 miles. Check your owner's manual for the recommended replacement schedule for your specific vehicle.