Dorman 266-010 Engine Oil Pan - Lower

Dorman OE FIX Engine Oil Pan for GM Applications

Dorman 266-010 is a steel engine oil pan built as an OE FIX replacement for select General Motors vehicles. It addresses a common failure point on the original design by using a welded drain plug bung and an upgraded larger thread size to help reduce repeat damage from over-torque. This oil pan is a direct-fit solution for lower engine applications on the Cadillac CT4, Chevrolet Colorado, Chevrolet Silverado 1500, GMC Canyon, and GMC Sierra 1500.

• Steel construction with a painted black finish
• Front sump, wet-sump design for lower engine mounting
• Welded drain plug bung instead of a pressed-in receptacle
• Upgraded drain thread size: M14 x 1.5
• Oil pan depth and shape matched for OE-style replacement
• Includes a magnetic drain plug for added engine protection
• New crush washer and gasket included for a complete repair
• Compatible with select 2019-2025 Chevrolet Silverado 1500 and 2019-2025 GMC Sierra 1500 applications

Detailed Product Overview

This Dorman 266-010 engine oil pan is engineered for vehicles that originally used a pressed-in drain plug boss that can leak after improper drain plug tightening. By replacing that weak point with a welded bung, the pan helps reduce the chance of repeat seepage at the drain area. The larger thread size also provides more tolerance against future over-torque events, making it a practical OE-style repair for GM trucks and cars that need a lower-position oil pan replacement.

Fitment includes 2020-2025 Cadillac CT4, 2023-2025 Chevrolet Colorado, 2019-2025 Chevrolet Silverado 1500, 2023-2025 GMC Canyon, 2019-2025 GMC Sierra 1500, plus 2022 Chevrolet Silverado 1500 LTD, 2022 Chevrolet Silverado 1500 Nueva, and 2022 GMC Sierra 1500 Limited. This part cross-references GM 12688474 and 12694307 for the same application.

What This Oil Pan Helps Address

• Oil leaks at the drain plug receptacle
• Damage caused by over-tightened drain plugs
• Repeat failures from a pressed-in plug boss design
• Need for a direct replacement oil pan on lower engine applications
• Drain-area contamination concerns with a magnetic plug

Installation Notes and Tips

Verify engine code, lower oil pan configuration, and drain thread size before installation. Clean the sealing surfaces thoroughly, replace the gasket during service, and torque the drain plug carefully to avoid damaging the new threads. Confirm clearance around the front sump layout and inspect the mounting holes and mating surfaces for distortion before final assembly.

Quality Assurance

Dorman OE FIX parts are designed to improve on known OE failure points while maintaining direct replacement fitment. Part number 266-010 is built for standard replacement service on select GM vehicles and includes the sealing components needed for a complete oil pan repair.