Dorman 65328 Engine Oil Drain Plug

Engine Oil Drain Plug for OE-Style Service

Dorman 65328 is a direct replacement engine oil drain plug for vehicles that use an M12-1.75 coarse metric thread. It is built from steel with a hex head and includes a gasket seal for a proper oil pan seal during routine service.

Compatible with select 1988-1991 Buick Skylark, Oldsmobile Cutlass Calais, and Pontiac Grand Am applications, this drain plug matches the original thread pitch and shank length for a precise fit. Dorman 65328 is a practical replacement when the original plug is damaged, worn, or no longer sealing correctly.

• Steel construction with a silver finish
• M12-1.75 metric coarse thread
• Hex head drive with 6-point socket engagement
• Gasket seal included
• Standard oil drain plug design for conventional drain service
• Direct replacement for OE-style oil pan service

Detailed Product Information

This Dorman oil drain plug is engineered to match the original thread pitch and thread size used on the listed applications, helping restore a secure seal at the oil pan drain opening. The 0.585-inch shank length, 12 mm thread diameter, and 1.75 thread pitch support proper engagement, while the included gasket helps complete the sealing surface. The Dorman 65328 part number is also referenced as 22535682 for the same application.

For buyers searching for an oil drain plug for 1988-1991 Buick Skylark, 1988-1991 Oldsmobile Cutlass Calais, or 1988-1991 Pontiac Grand Am, this replacement offers the correct metric fitment details in a standard drain plug format. Dorman 65328 is a straightforward service part for maintaining the engine oil drain point.

What It Helps Address

• Stripped or worn drain plug threads
• Oil seepage at the drain plug sealing surface
• Damaged original equipment drain plug hardware
• Incorrect thread pitch from prior replacement parts
• Routine oil service on listed Buick, Oldsmobile, and Pontiac models

Installation Notes and Tips

Verify the oil pan thread size before installation and confirm the drain opening is clean and free of debris. Install the plug by hand first to avoid cross-threading, then tighten with the correct hex tool to the vehicle manufacturer’s specification. Replace the gasket seal if the sealing surface shows wear or damage.

Quality Assurance

This replacement drain plug is built as a direct-fit service part with OE-style dimensions and thread matching for the listed applications. Dorman’s replacement hardware line focuses on restoring original function with parts that follow the required fitment specifications.