Fram Cross Reference Chart: How to Find the Right Filter Using Fram's Lookup System

If you're standing in an auto parts store holding a Fram filter number — or trying to match a competitor's filter to a Fram equivalent — a cross reference chart is the tool that connects those dots. Here's how the system works, what the numbers mean, and what to watch for when using cross reference data.

What a Filter Cross Reference Chart Does

A cross reference chart maps one manufacturer's part number to equivalent part numbers from other brands. For oil filters, air filters, cabin air filters, and fuel filters, this lets you answer: "If my car takes a Purolator L14459, what's the Fram equivalent?" — or the reverse.

Fram publishes cross reference data that works in both directions. You can start with a Fram part number and find competitors' equivalents, or start with a competitor's number and find the matching Fram filter. The same data is embedded in lookup tools on Fram's website, in printed filter catalogs, and in the databases used by most auto parts retailers.

Cross reference charts don't just apply to oil filters. Fram produces cross reference data across their full product line, including:

• Oil filters (Extra Guard, Ultra Synthetic, Tough Guard, XG series)
• Air filters (engine air filtration)
• Cabin air filters (Fresh Breeze, CF series)
• Fuel filters
• Transmission filters

How Fram Part Numbers Are Structured

Fram uses an alphanumeric prefix system to indicate filter type:

The numbers that follow the prefix correspond to the filter's physical dimensions, thread size, bypass valve setting, and application fitment — not just a marketing designation. Two filters with different prefixes (say, PH3600 vs. XG3600) share the same base fitment but differ in construction, media type, or drain-back valve design.

How to Use Fram's Cross Reference Lookup 🔍

Fram's online lookup tool (available at framfilters.com) lets you search by:

• Year / Make / Model / Engine — the most reliable method
• Competitor part number — enter a Wix, Purolator, Mobil 1, K&N, or other brand's number to find a Fram equivalent
• Fram part number — to verify fitment or find cross-references

Printed cross reference guides organized by competitor brand are also available through Fram's distributor network and in many shop reference binders. These are updated periodically, so print versions may lag behind new model fitments by a model year or two.

What "Cross Reference Equivalent" Actually Means

This is where a lot of confusion happens. A cross reference match means the filters share the same basic fitment criteria — thread pitch, gasket diameter, overall height, and bypass valve range are typically within spec. It does not guarantee that every construction detail is identical.

Key differences that won't show up in a simple cross reference chart include:

• Filtration media type — synthetic vs. cellulose vs. blended
• Micron rating — how fine the filtration is
• Anti-drain-back valve material — silicone vs. rubber (relevant for cold-start performance)
• Bypass valve cracking pressure — matters for high-performance or turbocharged engines
• Filter capacity and service life — a standard and extended-life filter may cross reference to each other but carry different recommended change intervals

When using a cross reference chart, you're confirming the filter fits — you're still making a separate decision about whether the filter's performance tier is right for your application.

Variables That Affect Which Cross Reference Result Is Useful

Not every cross reference result is equally applicable. Several factors shape whether a listed equivalent is a practical match:

Engine type. Turbocharged, diesel, or high-performance engines often have stricter requirements around bypass pressure and anti-drain-back valves. A filter that cross-references correctly for a naturally aspirated engine may not be the right call for a turbo application.

Oil type and change interval. If you're running full synthetic oil and extending drain intervals, you'd want a filter rated for that interval — not just any cross reference match.

Model year and platform variations. Some vehicles share an engine across multiple years but changed filter location or thread spec in a mid-cycle refresh. Cross reference lookups by vehicle year/make/model/engine are more reliable than lookups by a previous part number alone.

Application-specific service bulletins. Some manufacturers have issued guidance recommending specific filter specs for their engines. A generic cross reference won't reflect those nuances.

Competitor Brands Commonly Listed in Fram Cross Reference Data

Fram's cross reference database typically includes equivalents for:

• Purolator / PureONE
• Wix / NAPA Gold
• Bosch
• Mobil 1 / Mobil Extended Performance
• K&N
• AC Delco / ACDelco PF series
• Motorcraft
• Mann-Filter
• STP / Champion

Coverage varies by filter category — oil filter cross references are the most comprehensive. Cabin air filter and fuel filter coverage may be narrower depending on the application.

Where Cross Reference Charts Fall Short

Cross reference tools are a starting point, not a final answer. The chart tells you what fits — your vehicle's owner's manual, the engine's service requirements, and your oil change interval determine what should be used. 🔧

A filter that cross-references correctly but comes from a lower performance tier than what your engine needs still technically fits — it just may not perform as required. Understanding the difference between a cross reference match and a specification match is what separates a confident parts selection from a guess.

Your specific vehicle, engine variant, oil type, and change interval are the pieces the chart doesn't have — those stay with you.