BCBC M573 Engine Oil Pump

Engine Oil Pump Overview

This Melling engine oil pump, part number M573, is a standard replacement pump built for consistent oil pressure and efficient circulation. It uses steel gears, an aluminum housing, and a rotary design to support dependable engine lubrication in compatible Mazda applications.

Key Features

• Standard replacement engine oil pump for compatible applications
• Steel gears machined to close tolerances for efficient operation
• Aluminum housing and cover with rust-preventative finish
• Rotary pump design with standard pressure and standard volume output
• Individually tested for pressure and flow under operating conditions

Detailed Description

Melling part number M573 is engineered with gear and gerotor technology to deliver controlled oil movement and stable engine pressure. The precision-ground end plates and machined steel gears are built to reduce wear and maintain efficient pump performance. This oil pump is a direct fit for select Mazda 3, CX-3, CX-5, and MX-5 Miata applications, including stock configurations and the listed Mexico-built Mazda 3 application. This part cross-references Monroe Shocks & Struts (e.g., OP4309, OPMA32) for the same application.

What It Is Used For

• Restoring proper oil pressure in a worn or failing pump
• Addressing low oil pressure concerns caused by internal pump wear
• Replacing a pump with reduced flow or inconsistent lubrication output
• Supporting engine lubrication after oiling-system service or rebuild work

Installation Notes and Tips

Verify the engine code, mounting pattern, and pickup tube dimensions before installation. This pump uses a timing chain drive, a 3-hole mounting pattern, and does not include a gasket, seal, drive shaft, or pickup screen. Confirm all sealing surfaces are clean and inspect the oiling system for debris before assembly.

Quality Assurance

Melling manufactures this pump to high production standards and tests each unit for pressure and flow to verify operation under conditions that simulate real engine use. Part number M573 is built as a standard replacement oil pump for consistent service in the listed applications.