FRAM Cross Reference: How to Find Compatible Oil and Air Filters by Part Number

When a filter is labeled with a FRAM part number, that number isn't just a product code — it's a key to a whole network of equivalent parts made by other brands. Understanding how FRAM cross reference works helps you find the right filter whether you're buying OEM, aftermarket, or switching between brands entirely.

What Is a Filter Cross Reference?

A cross reference is a lookup system that matches one manufacturer's part number to equivalent parts from other manufacturers. In the filter world, this matters because the same physical filter — same thread size, bypass valve rating, gasket diameter, and flow specs — might be sold under a dozen different brand names with a dozen different part numbers.

FRAM publishes its own cross reference data, and third-party databases aggregate it alongside data from competing brands like Purolator, WIX, Mobil 1, K&N, Bosch, AC Delco, Baldwin, Donaldson, and others. When you search a FRAM number, you're looking for equivalent fitments — not necessarily identical internal construction.

What FRAM Filter Numbers Tell You

FRAM uses alphanumeric codes to indicate filter type and application:

For example, PH3600 is a full-flow spin-on oil filter used across a wide range of domestic V8 applications. XG3600 would be the extended-life version of the same fitment. The number suffix generally tracks to the application group, not a random sequence.

How the Cross Reference Process Works 🔍

Step 1: Start with what you have. If you already have a FRAM number — from your old filter, your owner's manual, or a parts store lookup — enter it into a cross reference tool.

Step 2: Use a cross reference database. Several resources aggregate this data:

• FRAM's own website has a vehicle lookup and cross reference tool
• Retailer sites (AutoZone, O'Reilly, RockAuto) cross reference by vehicle or part number
• Third-party tools like Wix Filters Xref or BuyFilters.com index multiple brands simultaneously

Step 3: Verify the fitment, not just the match. Cross reference results show equivalency, but you should still confirm thread pitch, filter height, and bypass valve pressure if you're switching brands. Two filters that cross reference may differ slightly in media quality, pleat count, or anti-drainback valve design.

Why People Cross Reference FRAM Numbers

Price comparison. A FRAM PH16 and a WIX 51516 may fit the same application. The price difference between the two — at different stores on different days — can be significant.

Availability. If a specific FRAM filter is out of stock, cross referencing opens up alternatives that are in stock right now without guessing on fitment.

Upgrading filter media. Some drivers cross reference to find a synthetic or extended-interval version of a filter that fits the same application. Moving from a standard FRAM PH to an XG (extended guard) or to a competing brand's synthetic option falls into this category.

Heavy-duty or industrial applications. Mechanics working on fleet vehicles, diesel equipment, or older engines may need to cross reference into Baldwin or Donaldson catalogs, where heavy-duty equivalents are common.

Variables That Affect Which Filter Is Right ⚙️

Cross referencing gets more complicated depending on your situation:

• Engine type. A gas engine filter and a diesel engine filter for similar applications differ substantially in construction. Don't cross reference across fuel types without verifying specs.
• Model year. Older and newer versions of the same engine sometimes take different filters. A 2005 and a 2019 version of the same platform may not share the same filter application.
• Oil change interval. Extended-life synthetic oils typically pair with filters rated for the same interval. A standard filter crossed to an extended-interval equivalent isn't necessarily rated for 10,000+ miles.
• Turbocharged engines. Turbo applications often specify higher-quality anti-drainback valves and stronger bypass valve ratings. Cross referencing into a filter not designed for forced induction can create issues at startup.
• Air and cabin filters. These cross reference by physical dimensions and housing fitment rather than thread specs. Thickness, fold count, and media type still vary between equivalent numbers from different brands.

What Cross Reference Doesn't Confirm

Cross reference databases confirm fitment compatibility — they don't confirm performance equivalency. Two filters with the same thread size and dimensions may differ in:

• Filtration efficiency (micron rating)
• Dust-holding capacity
• Burst pressure rating
• Media type (cellulose vs. synthetic blend vs. full synthetic)

A filter that "fits" and a filter that performs at the same level are related but separate questions. The cross reference gets you to the right physical application. What the filter does inside that application depends on its construction.

How Results Vary in Practice

A driver running a late-model import 4-cylinder searching a FRAM oil filter number will typically find 8–12 equivalent part numbers across major brands. A driver with an older domestic truck engine may find 20 or more, because that platform supported high production volume over many years. Conversely, a newer turbocharged European engine might return only 2–3 verified equivalents, and some of those may be restricted to OEM-branded filters.

The more specific the engine application — especially late-model, turbocharged, or performance-oriented — the narrower and more important the cross reference verification becomes.

Your specific vehicle, engine variant, model year, and oil change interval are the variables that determine which cross reference results actually apply to you.