BCBC M555 Engine Oil Pump

Engine Oil Pump Overview

This Melling engine oil pump is a standard replacement part for stock applications that require consistent oil pressure and efficient circulation. Built with a cast aluminum housing, cast iron cover, and steel rotor, it is engineered for dependable operation in GM truck and SUV platforms. Part number M555 is listed for a wide range of Chevrolet, GMC, and Cadillac applications.

Key Features

• Standard replacement oil pump with rotary design
• Cast aluminum housing and cast iron cover for durable construction
• Steel rotor and close-tolerance machining for efficient pump operation
• Standard pressure and standard volume configuration
• Rust preventative finish for added surface protection
• O-ring included; gasket or seal not included

Detailed Description

Melling part number M555 uses gear and gerotor technology to support proper engine oil pressure and consistent flow. The pump is individually tested for pressure and flow under conditions that simulate real engine operation, and its precision-ground end plates are built for wear resistance. This makes it a practical choice for maintaining lubrication performance in Chevrolet Silverado 1500, GMC Sierra 1500, and related GM full-size truck and SUV engines.

The Stock product line focuses on standard replacement coverage for everyday service needs. For buyers looking for an OE-style engine oil pump for GM applications, M555 provides the construction and testing standards expected in a direct replacement part.

What It Helps Address

• Low oil pressure caused by a worn pump
• Inconsistent oil circulation in high-mileage engines
• Reduced lubrication performance from internal wear
• Pressure loss related to pump housing or rotor wear

Installation Notes

Verify engine application, pump drive type, and pickup tube dimensions before installation. This pump uses a crankshaft drive type and a standard pressure, standard volume configuration. The pump cover is included, while a gasket or seal is not included. Confirm all mating surfaces are clean and inspect the oiling system for wear or contamination during service.

Quality Assurance

Melling manufactures this oil pump to high production standards and tests each unit for pressure and flow before release. Part number M555 cross-references DNJ OP4243 for the same application.