Fram Filter Cross Reference Chart: How to Find the Right Equivalent Filter

When you need to replace an oil filter, air filter, or fuel filter and the brand on the shelf isn't the one you're looking for, a cross reference chart is how you find an equivalent. Fram is one of the most widely recognized filter brands in North America, so cross referencing to or from a Fram part number is an extremely common task — whether you're a DIYer working in a home garage or a shop tech sourcing parts from an unfamiliar supplier.

Here's how filter cross referencing works, what the charts actually tell you, and where the process gets complicated.

What a Filter Cross Reference Chart Does

A cross reference chart maps one manufacturer's part number to an equivalent part number from another manufacturer. The underlying idea is straightforward: many filter brands source their filtration media and housings from a limited number of manufacturing facilities, and the same basic filter design often gets sold under a dozen different brand names with different part numbers.

If a store is out of stock on a Fram PH3600, for example, a cross reference chart tells you that a Wix 51060, a Purolator L14459, or a Bosch 3323 may be a direct equivalent — same thread pitch, same bypass valve rating, same gasket diameter, same overall dimensions.

Cross references work in both directions:

• Fram to another brand — you have a Fram number and need an equivalent
• Another brand to Fram — you have a competitor's number and want to find the matching Fram filter

The Main Fram Filter Lines and Their Naming Conventions

Fram uses distinct prefix letters to organize its product lines. Understanding the prefix helps you identify what type of filter you're dealing with before you ever pull up a chart.

The same engine may have a corresponding filter across multiple Fram product lines — a PH, a TG, and an XG — all designed to fit the same application but with different media, construction, and claimed service intervals.

How to Use a Cross Reference Chart

Most cross reference lookups work one of two ways:

By Fram part number: You already know the Fram number and want to find an equivalent from ACDelco, Motorcraft, Baldwin, Wix, Mobil 1, K&N, Purolator, Mann, or another brand.

By competitor part number: You have a number from another brand and want to find the Fram equivalent.

Both Fram's own website and third-party parts databases (such as those used by AutoZone, O'Reilly, NAPA, and Rock Auto) maintain searchable cross reference databases. The results typically list all known equivalents across multiple brands simultaneously.

You can also look up filters by vehicle application — year, make, model, and engine displacement — which bypasses the part number entirely and goes straight to what fits your vehicle.

🔧 Where Cross References Get Complicated

A cross reference result tells you a filter fits — it doesn't tell you the filters are identical in every meaningful way. Two filters with the same thread and dimensions can differ in:

• Filtration efficiency — measured in microns; finer filtration captures smaller particles
• Bypass valve opening pressure — affects oil flow under cold starts
• Anti-drainback valve design — prevents oil from draining out of the filter when the engine sits
• Media type — cellulose, synthetic blend, or full synthetic
• Capacity — how much contaminant the filter can hold before bypassing

These differences matter most when you're comparing filters at different price points or service interval ratings. A standard economy filter and an extended-interval synthetic filter may both appear as "equivalents" in a cross reference, but they're not the same product.

Extended interval filters (like Fram's XG series or competitors' equivalents) are designed to perform over longer oil change intervals — often 10,000–15,000 miles or more. Cross referencing to a standard filter and using it at an extended interval would be a mismatch, regardless of what the chart says about fitment.

Variables That Affect Which Cross Reference You Should Use

Even when a chart gives you several valid equivalents, the right choice for your situation depends on factors the chart doesn't know:

• Your oil change interval — shorter intervals give you more flexibility; extended intervals require filters rated for that use
• Your engine's age and condition — high-mileage engines sometimes benefit from specific filter designs
• The manufacturer's recommendation — some OEMs specify filter requirements that not all aftermarket options meet
• Your climate — cold climates can stress bypass valves at startup, making bypass valve pressure ratings more relevant
• Synthetic vs. conventional oil — extended-interval synthetic oil pairings generally call for extended-interval filters

The Spectrum of Cross Reference Accuracy

Cross reference databases are maintained by both manufacturers and third-party aggregators, and they're not always in perfect agreement. A Fram database might list three equivalents for a given part number; a Wix database might list only two, and they might overlap but not match completely.

Occasionally a cross reference will be outdated — a part number that's been superseded, discontinued, or revised without the database being updated. This is particularly common with older vehicles where filter designs have been updated over the years.

For critical applications — diesel engines, turbocharged engines, or vehicles under powertrain warranty — it's worth verifying that any cross-referenced filter meets OEM specifications, not just dimensional fitment.

The chart gets you most of the way there. Whether it gets you all the way depends on your specific engine, how you use your vehicle, and what the filter will actually be asked to do.