STP Oil Filter Cross Reference: How to Find Compatible Replacements

When your owner's manual calls for a specific oil filter — or when you're looking at an STP filter on the shelf — a cross reference helps you confirm which filters are interchangeable across brands. Understanding how that process works can save you time, prevent costly mistakes, and help you make an informed choice at the parts counter or online.

What Is an Oil Filter Cross Reference?

An oil filter cross reference is a compatibility lookup that maps one brand's part number to equivalent filters from other manufacturers. If you know the STP part number your vehicle takes — say, S3614 or S6607 — a cross reference chart tells you which Fram, Motorcraft, Bosch, Wix, Purolator, or ACDelco filters share the same thread size, bypass valve pressure, anti-drainback valve design, and dimensions.

This matters because oil filters are not universally interchangeable, even when they look similar on the shelf. Thread pitch, outer diameter, filter height, and internal construction must all match your engine's specifications. A filter that threads on but has the wrong bypass valve rating can allow unfiltered oil to circulate under certain conditions.

How STP Filters Are Numbered

STP organizes its oil filter lineup using a consistent numbering format — typically the letter S followed by four to five digits. These numbers correspond to specific fitment profiles, not vehicle makes or models directly. The same STP filter number may fit dozens of different vehicles from multiple manufacturers, as long as those engines share the same filter interface specifications.

STP filters are manufactured through Champion Laboratories, which also produces several private-label and store-brand filters. This means some cross references between STP and other brands aren't just "compatible" — they may share the same production line.

Where to Run an STP Cross Reference 🔍

Several reliable methods exist:

Parts store lookup tools — Retailers like AutoZone, O'Reilly, NAPA, and Advance Auto Parts have in-store and online lookup systems. Enter your vehicle's year, make, model, and engine size, and the system returns compatible filters across all brands they carry.

Manufacturer cross reference databases — Wix Filters, Purolator, and Fram each publish searchable cross reference tools on their websites. You can enter an STP part number directly and retrieve their equivalent.

Printed cross reference guides — Older method, still useful at independent shops. Champion Laboratories historically published printed cross reference booklets that covered STP alongside other brands in their family.

OBD fitment databases — Third-party sites like Midwest Filtration or FilterCross.com aggregate cross reference data from multiple manufacturers, which can be useful for confirming compatibility from multiple angles.

No single source is infallible. Cross reference data gets updated as manufacturers discontinue or revise part numbers, so confirming through two sources is a reasonable habit.

Key Specs That Must Match

When using any cross reference, the underlying assumption is that the listed filters share these critical specifications:

Cross reference tools assume these match — but if you're using an older chart or sourcing a discontinued number, it's worth verifying specs independently rather than relying on the listing alone.

Variables That Shape Your Specific Situation

The right cross reference result isn't the same for every driver. Several factors affect which filters are actually appropriate for your vehicle:

Engine type and displacement — A turbocharged engine, a high-performance V8, or a diesel powerplant often has different filter requirements than a naturally aspirated four-cylinder. Some engines require higher-capacity filters with stronger bypass valves.

Oil change interval — If you're running extended drain intervals with full synthetic oil, the filter media needs to hold up accordingly. Not all filters with the same fitment specs carry the same mileage rating. STP offers both standard and extended-life versions, and cross references between them aren't always equivalent.

Model year — Some vehicles received mid-cycle engineering changes that altered filter specs. The same model in different years may require different filters.

Aftermarket modifications — Remote filter kits, oil coolers, or dry-sump systems may affect which filter format you need entirely.

Brand preferences and budget — Cross reference tools show compatibility, not equivalence in quality. Two filters with identical fitment specs can differ substantially in media construction, filter area, and build quality.

What Cross Reference Charts Don't Tell You

A cross reference confirms that two filters can thread onto the same engine. It doesn't confirm that both filters deliver the same filtration efficiency, have the same media surface area, or meet the same OEM specification. Premium filters and budget filters can share a cross reference number while performing differently under extended use or high operating temperatures.

This is especially relevant when crossing from an STP standard filter to a competing brand's high-mileage or synthetic-rated equivalent — or vice versa. The cross reference covers fitment. The rest of the decision depends on your vehicle's service history, the oil you're using, and how long you plan to run between changes.

The part number match gets you in the right ballpark. Whether a specific filter is the right choice for your engine's condition, your oil type, and your maintenance habits is a question the cross reference alone can't answer.