Donaldson P550788 Engine Oil Filter

Engine Oil Filter Overview

Donaldson P550788 is a spin-on, full-flow engine oil filter built for heavy-duty lubrication systems. It uses cellulose media and is specified for applications that require a 1 1/2-16 UN thread and a large canister format.

Key Features

• Spin-on full-flow design for straightforward oil filtration service.
• Cellulose filter media for standard contaminant capture.
• ISO 16889 efficiency testing standard listed for performance reference.
• Collapse burst rating of 10.3 for structural strength specification.
• Dimensions and gasket sizing are listed for application matching.

Fitment Details

Compatible with 2008-2011 Peterbilt 365, lube filter, spin-on full flow. This part cross-references Baldwin B7402 and Gates 51801 for the same application. The Donaldson P550788 is also referenced by interchange numbers 1801, 2492347, L45923, LF3472, and SO3472.

What It Helps Address

• Oil contamination buildup in the lubrication circuit.
• Restricted oil flow caused by a loaded filter element.
• Service intervals that require a replacement spin-on filter.
• Fitment matching for the correct thread, gasket, and canister dimensions.

Installation Notes and Tips

Verify the thread size, gasket dimensions, outer diameter, and length against the original filter before installation. Confirm the application is a full-flow, spin-on oil filter and match the listed fitment for Peterbilt 365 models before service. Follow the engine manufacturer’s oil change and filter replacement procedure.

Quality Assurance

Donaldson lists this filter with ISO 16889 efficiency testing and a specified collapse burst rating for application verification. Use the part number P550788 to confirm the correct replacement before installation.