Cross Reference FRAM Oil Filters: How to Find the Right Match for Your Vehicle
When you need to replace an oil filter and FRAM is what's on the shelf — or what you already own — knowing how to cross reference that part number against other brands (or verify it fits your engine) is a basic but important skill. Here's how filter cross referencing works, what FRAM's system looks like, and what factors shape whether a given filter is the right one for your vehicle.
What "Cross Referencing" a Filter Actually Means
A cross reference is a lookup that matches one manufacturer's part number to equivalent or compatible parts from other brands. For oil filters, this means finding a FRAM number that corresponds to a Wix, Purolator, Bosch, Mobil 1, or OEM filter — or going the other direction, starting with a FRAM number and confirming what vehicles it fits.
Cross referencing doesn't mean every matched filter is identical. It means the filters share the same basic fitment specs: thread size, gasket diameter, and overall dimensions that allow proper installation. Internal construction — media type, bypass valve pressure rating, anti-drainback valve design — can still differ between brands even when two filters "cross reference" to each other.
How FRAM's Part Number System Works
FRAM uses a letter-prefix system to categorize filter types:
| Prefix | Filter Type |
|---|---|
| PH | Extra Guard (standard spin-on) |
| XG | Ultra Synthetic (extended life) |
| TG | Tough Guard (mid-tier) |
| CH | Cartridge-style filters |
| FP | Fuel filters |
| CA | Air filters |
The number following the prefix identifies the fitment group. For example, PH3506, XG3506, and TG3506 all fit the same set of vehicles — they're just different product lines within FRAM's lineup, using the same core fitment number.
When you cross reference, you're usually working with that core fitment number (3506, in this case) and matching it across brands.
Where to Actually Run a Cross Reference 🔍
Several tools make this process straightforward:
FRAM's own website has a vehicle lookup and part number search. Enter your year, make, model, and engine size to see which FRAM filters fit. You can also enter a competitor's part number to find the FRAM equivalent.
Third-party cross reference databases — such as those offered by Wix/NAPA, RockAuto, and Purolator — work similarly. Many allow you to input a FRAM part number and return a list of competing brands' equivalent numbers, or vice versa.
Retail parts store lookups (AutoZone, O'Reilly, Advance Auto Parts) use their own cataloging systems, which typically return multiple brand options once you enter your vehicle's year, make, model, and engine displacement.
The engine displacement detail matters more than many drivers realize. A 2015 Ford F-150 with a 2.7L EcoBoost uses a different filter than the same year F-150 with the 5.0L V8. Same truck, different filter. Always confirm the engine size when looking up any filter.
What the Cross Reference Lookup Doesn't Tell You
A cross reference confirms fitment — it doesn't evaluate quality, longevity, or suitability for your specific driving conditions. A few factors that shape which matched filter makes sense for a given vehicle and owner:
Oil change interval. Standard FRAM filters (PH series) are rated for conventional service intervals — typically 3,000 to 5,000 miles. If you're running extended oil change intervals with full synthetic oil, a standard filter may not be the right tool, regardless of what it cross references to.
Engine age and condition. High-mileage engines can have slightly different lubrication demands, and some owners prefer filters with higher-micron filtration ratings for older engines.
OEM vs. aftermarket. Some vehicle manufacturers — particularly certain European brands and newer turbocharged engines — have specific filtration recommendations. Cross referencing to an aftermarket filter technically "fits" but may not meet the OEM spec for micron rating or bypass pressure.
Driving environment. Dusty conditions, towing, track use, or extreme temperatures can push an engine harder and make filtration media quality more relevant.
Reading the Specs Behind the Part Number 🔧
When comparing cross-referenced filters, look beyond the number itself:
- Micron rating — lower micron ratings filter finer particles (a 20-micron filter captures smaller contaminants than a 40-micron filter)
- Bypass valve rating — measured in PSI; determines when the filter allows unfiltered oil to pass (relevant during cold starts)
- Anti-drainback valve — prevents oil from draining back into the pan when the engine is off; critical on side-mounted and angled filter applications
- Media type — synthetic media generally outperforms cellulose at equivalent mileage intervals
FRAM publishes some of these specs in their product literature. Competing brands do the same, so a real comparison between cross-referenced filters means looking at specs, not just confirming the numbers align.
When the Numbers Don't Match Up
Cross reference tools are generally reliable, but they're not perfect. Catalog errors happen, especially on less common vehicles, engines with mid-cycle updates, or imported models. If you find conflicting results across two different databases, go back to the basics: thread pitch, outside diameter, and installed length. These three measurements determine whether a filter physically fits and seals correctly.
Your vehicle's owner's manual lists the OEM filter spec. That number can be cross referenced independently through any of the tools above.
The cross reference gives you options — but whether a given option is right for your engine, your oil type, and your maintenance schedule depends on details specific to your vehicle and how you use it.
