NAPA Oil Filter Cross Reference Chart: How to Find Compatible Filters Across Brands

Oil filter cross referencing is one of the most practical skills a DIY mechanic can develop. If your usual NAPA filter is out of stock, or you want to compare it against a Fram, Wix, or Purolator equivalent, a cross reference chart tells you which part numbers are interchangeable — without guessing.

Here's how the system works, what the numbers mean, and why the "right" answer still depends on your specific vehicle and situation.

What Is an Oil Filter Cross Reference?

An oil filter cross reference is a lookup system that matches one manufacturer's part number to equivalent part numbers from other brands. The idea is that filters with identical or compatible specifications — thread pitch, gasket diameter, bypass valve pressure, anti-drainback valve design, and micron rating — can be substituted for one another.

NAPA sells oil filters under its Gold and Platinum lines (manufactured by Wix, a Filtran brand). Because Wix produces filters for many private-label and house brands, NAPA filter numbers often cross-reference cleanly to Wix, and from there to Fram, Purolator, Mobil 1, K&N, and others.

How NAPA Filter Numbers Are Structured

NAPA uses a numeric part number system. The NAPA Gold line (formerly "NAPA Proselect") uses four- and five-digit numbers such as 1515, 1522, or 21060. The NAPA Platinum synthetic media filters carry similar numbering with a different prefix depending on the catalog.

Because Wix manufactures many NAPA filters, there's typically a direct numeric relationship between the two. A NAPA Gold 1515, for example, corresponds to a Wix 51515 — the "5" prefix is a Wix convention, not a NAPA one. That pattern holds across much of the NAPA Gold lineup, though not universally.

Common Cross Reference Pairings 🔧

The table below shows representative cross references across major brands. These are general examples — always verify against your vehicle's application before purchasing.

Important: Cross reference charts show likely compatibility, not guaranteed fitment. Filter specifications vary by production run, and some brands use slightly different bypass valve settings or media grades even when the housing dimensions match.

Where to Look Up Cross References

Several tools make cross referencing straightforward:

• NAPA's own catalog at napaonline.com allows you to search by vehicle year, make, model, and engine to find the correct NAPA filter, then compare across brands
• Wix's filter lookup tool is widely used because of Wix's role as an OEM supplier — it often shows the broadest range of cross references
• Fram's application guide and Purolator's lookup both work similarly — search by vehicle application or competitor part number
• RockAuto lists multiple brands side by side for the same application, making it easy to compare part numbers and prices

Third-party cross reference aggregators exist but vary in accuracy. Manufacturer-direct tools are more reliable.

Variables That Affect Whether a Cross Reference Is Valid

Not every filter that shares a thread size is truly interchangeable. Several factors determine whether a cross reference is actually safe to use:

Bypass valve pressure. This valve opens if the filter becomes clogged, allowing unfiltered oil to pass rather than starving the engine. Different engines specify different bypass pressure thresholds. A filter with the wrong bypass setting can allow bypass too early — or not at all.

Anti-drainback valve. Engines where the filter mounts sideways or at an angle need a filter with a functioning anti-drainback valve to prevent oil from draining out of the filter between starts. Not all filters include one, and not all that include one are equally effective.

Media grade. Standard, synthetic-blend, and full-synthetic media handle fine particulates differently. If your engine and oil type call for extended-drain capability, the media matters — not just the housing dimensions.

Filter height and clearance. Some engine bays have tight clearances. A filter that technically fits the thread may be too tall for the space available.

Gasket material and seating. Some applications require a specific gasket compound or seating surface to seal properly at operating pressure.

How Filter Quality Lines Compare

NAPA, like most major brands, offers tiered product lines. The NAPA Gold (standard) is a conventional media filter suited to normal service intervals. The NAPA Platinum uses synthetic media and is designed for extended drain intervals, typically aligning with full-synthetic oil change schedules. The equivalent Wix lines follow the same logic — Wix for standard, Wix XP for extended performance.

When cross referencing, matching the tier matters, not just the part number. Substituting a standard-media filter for a synthetic-media one may still fit — but the performance and rated interval won't be equivalent.

Why the "Right" Filter Still Depends on Your Situation 🔎

Cross reference charts narrow your choices — they don't make the final call for you. The correct filter for a 2008 Honda Civic is not the correct filter for a 2019 Ford F-150 EcoBoost, even if both happen to share a thread specification. Engine oil capacity, operating pressure, filter orientation, and manufacturer service recommendations all shape what "compatible" actually means in practice.

Your vehicle's owner's manual lists the specified oil filter type or standard it must meet. Some manufacturers — particularly for turbocharged engines, diesel applications, and performance vehicles — have stricter filter requirements than a general cross reference will reflect. The cross reference gets you to the starting point. Your vehicle's actual specifications, your oil type, and your service interval are the pieces that determine whether that starting point is also the finish line.