How to Convert Oil Filter Part Numbers: A Comprehensive Guide for Car Owners, Mechanics, and DIY Enthusiasts​

2025-10-13

If you’ve ever tried replacing an oil filter only to find your vehicle’s original part number is discontinued, out of stock, or unavailable in your region, you know how frustrating it can be. Converting oil filter part numbers—cross-referencing or matching them to compatible alternatives—is a critical skill for anyone maintaining a vehicle. This guide will walk you through everything you need to know: why part number conversion matters, how oil filter part numbers are structured, common scenarios where conversion is necessary, step-by-step methods to convert them, trusted tools and resources, and pitfalls to avoid. By the end, you’ll have the confidence to source reliable replacements, save time, and protect your engine.

Why Oil Filter Part Number Conversion Matters

Every oil filter is designed to meet specific vehicle requirements: flow rate, filtration efficiency, size, gasket type, and pressure tolerance. Using the wrong filter—even one that seemssimilar—can lead to poor engine protection, leaks, or even catastrophic damage. Yet, original equipment manufacturer (OEM) part numbers often become obsolete due to supply chain issues, design updates, or regional differences. This is where conversion comes in: it lets you identify aftermarket or alternative OEM filters that match your vehicle’s needs.

For example, a 2015 Honda Civic might list a Fram PH7317 as its OEM oil filter. If Fram discontinues it, converting the part number could reveal that Bosch P3270 or Mann W 68/3 is a direct replacement. Without this knowledge, you might waste time searching or risk installing an incompatible filter.

Understanding Oil Filter Part Number Structures

To convert part numbers effectively, you first need to decode what they mean. Most oil filter part numbers follow a pattern set by the manufacturer, combining letters and numbers to indicate specifications. While formats vary by brand, here’s a breakdown of common elements:

1. Brand Identifier

The first few characters often represent the brand. For example:

  • ​FRAM: Starts with “FR” or “Fram.”

  • ​Bosch: Begins with “BOS” or “P” (e.g., P3270).

  • ​Mann-Filter: Uses “W” followed by numbers (e.g., W 68/3).

  • ​AC Delco: Often starts with “AC” or “PF” (e.g., PF48).

2. Vehicle Application Codes

Next, numbers or letters may specify the vehicle make, model, year, or engine type. For instance:

  • A part number like “Hengst H550/1” might indicate Hengst’s 550 series for gasoline engines, with “1” denoting a specific application.

  • Toyota’s OEM filters often include codes tied to engine displacement (e.g., “90915-YZZE1” for 1.8L engines).

3. Performance or Design Features

Some brands use suffixes to denote upgrades, such as:

  • “HP” for high-performance filters.

  • “XL” for extended service life.

  • “C” for cold-climate performance.

Decoding these elements helps you identify which parts of the number are critical for compatibility (e.g., vehicle-specific codes) versus optional (e.g., performance suffixes).

Common Scenarios Requiring Part Number Conversion

You’ll need to convert oil filter part numbers in several situations:

1. OEM Part Discontinuation

Manufacturers frequently discontinue parts due to cost, design changes, or regulatory updates. For example, Ford’s 5W-20 oil filter for F-150s might switch from ESE-M2C153-A to a newer spec, making the old part number obsolete.

2. Regional Variations

Vehicles sold in different regions often have unique part numbers. A 2020 Volkswagen Golf sold in Europe might use a Mahle OC 534, while the U.S. version uses a Bosch 0986AFS006. Converting lets you source the correct filter regardless of where you live.

3. Aftermarket Upgrades

You might want to switch from OEM to a higher-quality aftermarket filter. For example, replacing a standard Purolator filter with a Wix XP or Royal Purple filter could improve filtration without sacrificing fit.

4. Emergency Replacements

If you’re stranded and only have access to a local auto parts store, converting your part number ensures you get a compatible filter quickly, even if it’s not the exact OEM part.

Step-by-Step Methods to Convert Oil Filter Part Numbers

Converting part numbers involves research and verification. Here’s how to do it reliably:

Step 1: Identify Your Current or OEM Part Number

Start by noting your vehicle’s current oil filter part number. You can find this:

  • On the filter itself (stamped or labeled).

  • In your owner’s manual.

  • Via your vehicle’s VIN (check online databases like RockAuto or AutoZone using your VIN to pull specs).

Example: A 2018 Toyota Camry LE might have a Denso 115010-6010 listed.

Step 2: Use Online Cross-Reference Tools

Numerous websites specialize in oil filter cross-referencing. These tools map OEM and aftermarket part numbers to compatible alternatives. Popular options include:

  • ​RockAuto: Enter your vehicle’s year, make, and model, then browse filters. The site shows compatible part numbers from multiple brands.

  • ​OilFilterCrossReference.com: A dedicated database where you input an OEM number and get a list of matches.

  • ​FilterManufacturer Websites: Brands like Bosch, Mann-Filter, and Wix have “cross-reference” sections on their sites. For example, entering a Fram PH7317 on Bosch’s site might return P3270 as a compatible filter.

Step 3: Verify Specifications

Even if a tool says two filters are compatible, double-check key specs:

  • ​Thread Size and Length: Mismatched threads (e.g., 16x1.5mm vs. 16x1.25mm) won’t seal properly.

  • ​Gasket Diameter and Material: The gasket must match the engine’s oil filter housing to prevent leaks.

  • ​Micron Rating: The filter should meet or exceed the OEM’s filtration efficiency (e.g., 20 microns vs. 30 microns).

  • ​Flow Rate: A filter with too low a flow rate can restrict oil to the engine.

Example: Converting a GM 12619350 to an aftermarket filter? Check that the alternative has a 1-inch NPT thread and a 4.5-inch height—critical for fitting the GM oil pan.

Step 4: Consult Manufacturer Support

If online tools are unclear, contact the aftermarket brand’s customer service. Provide your vehicle details and the OEM part number; they can confirm compatibility. For example, Mann-Filter’s tech support can tell you if their W 68/3 replaces a specific Honda filter.

Step 5: Test Fit (If Possible)

When in doubt, install the filter on the vehicle (with new oil) and check for leaks after driving. A dry run with the filter off the car—applying a thin layer of oil to the gasket and hand-tightening—can also reveal fitment issues.

Trusted Brands and Their Cross-Reference Patterns

Different brands have unique cross-referencing tendencies. Knowing these can speed up conversions:

  • ​Bosch: Often cross-references to Fram, Purolator, and AC Delco. A Bosch P3270 might replace Fram PH7317 and Purolator L20061.

  • ​Mann-Filter: Tends to align with Mahle and Hengst. Mann W 68/3 could be equivalent to Mahle OC 534.

  • ​Wix: Frequently matches Filtration Group brands like Champion and PureOne. Wix XP 51356 might replace Champion C-112.

  • ​Denso: Often corresponds to OEM Toyota and Lexus filters. Denso 115010-6010 could be interchangeable with Toyota 90915-YZZE1.

Pitfalls to Avoid When Converting Part Numbers

Even with research, mistakes happen. Steer clear of these errors:

  • ​Ignoring Regional Differences: A filter for a European-spec car might not fit a U.S.-spec model due to housing design changes.

  • ​Assuming “Universal” Means Universal: Some “universal” filters require adapters, which can fail over time.

  • ​Skipping the Spec Check: Thread size or gasket material mismatches are common when only relying on part number tools.

  • ​Using Old or Outdated Databases: Cross-reference tools need regular updates—stick to reputable sites with recent data.

Case Study: Converting a Ford F-150 Oil Filter Part Number

Let’s walk through a real-world example. A 2021 Ford F-150 with a 3.5L EcoBoost engine uses OEM part number FL-820S. Suppose FL-820S is discontinued. Here’s how to convert it:

  1. ​Identify OEM Specs: FL-820S has a 16x1.5mm thread, 4.75-inch height, and a 20-micron rating.

  2. ​Use RockAuto: Input the 2021 F-150, 3.5L EcoBoost. The site lists FL-820S as OEM and suggests alternatives: Bosch 3323, Wix 51356, and Motorcraft FL-820S (a remanufactured OEM option).

  3. ​Verify with Bosch: Bosch’s cross-reference tool confirms 3323 matches FL-820S in thread size, gasket diameter, and flow rate.

  4. ​Install: The Bosch 3323 fits perfectly, and oil pressure remains stable post-installation.

Conclusion: Mastering Oil Filter Part Number Conversion

Converting oil filter part numbers isn’t just about finding a replacement—it’s about ensuring your engine stays protected. By understanding part number structures, using trusted tools, verifying specs, and avoiding common mistakes, you can confidently source compatible filters, even when OEM parts are unavailable. Whether you’re a DIY enthusiast or a professional mechanic, this skill will save time, money, and unnecessary engine wear. Remember: when in doubt, double-check with manufacturers or cross-reference databases—your engine will thank you.

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