Oil Filter Upgrade

Introduction

Submitted by: PlumCrazy

After looking through the NAPA filter catalog, I found that the stock oil filter used on the Ford Ranger shares the same specifications as filters used on many larger Ford engines, including the 7.5L and 5.4L.
The stock Ranger filter for the 4.0L and 2.0L / 2.3L / 2.5L engines is the NAPA 1515, which crosses over to the Motorcraft FL-1A.

Stock Filter Specifications

• NAPA: 1515
• Motorcraft: FL-1A
• Thread Size: 3/4″-16
• Diameter: Approx. 3.6″
• Length: Approx. 5.35″
• Bypass Valve: 8-10 PSI
• Oil Capacity: Roughly 0.625-0.75 qt

I searched for a larger filter with the same thread size, gasket diameter, and sealing surface. The filter I found was the NAPA 1773, which is nearly 7″ long while maintaining the same basic fitment dimensions.

Larger Capacity Filter Option

• NAPA: 1773
• Purolator: L40017
• Length: 6.982″
• Bypass Valve: 8-10 PSI
• Oil Capacity: Roughly 1.25-1.5 qts

This larger filter increases oil capacity by approximately 1/2 quart.

I also found the NAPA 1333, which is slightly larger in diameter (3.7″) and the same 6.982″ length, but it uses a much higher bypass valve setting of 30 PSI, making it less desirable for this application.

Here are a few pics. It is still tucked up high enough to be protected.

Additional Notes

The larger 1773 filter should also work on the 2.0L / 2.3L / 2.5L engines, but clearance is limited. Those engines would likely require a 90-degree oil filter adapter to fit the longer filter.

Even with the larger filter installed, it still sits high enough to remain protected from trail obstacles and road debris.

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Last updated: May 23, 2026