Gates 31066 Engine Oil Filler Cap

Gates Oil Filler Cap 31066

The Gates 31066 oil filler cap is an OE Exact replacement built for dependable sealing and long service life. It uses metal and rubber construction with a silver finish, plus an included gasket or seal to help maintain a secure closure on the engine oil fill neck.

Compatible With a wide range of Chrysler, Dodge, Jeep, Chevrolet, and GMC applications, this Gates oil filler cap is a direct-fit solution for vehicles that use a twist-lock style cap. It is commonly searched as an oil filler cap for Jeep Wrangler, Jeep Cherokee, Dodge Dakota, and Chevrolet/GMC truck and van applications.

Key Features

• OE Exact replacement for factory-style fit and function
• Twist-lock cam type for secure engagement
• Metal and rubber construction for durability
• Silver finish
• Gasket or seal included
• Shell diameter: 2.25 in; neck diameter: 1.18 in; neck depth: 1 in
• Gates part number 31066

Product Details

Gates Oil Filler Caps are built with impact-resistant materials and heavy-gauge construction to support long service life in demanding engine bay conditions. The 31066 oil cap is sized for applications that require a 2.25-inch shell diameter and twist-lock retention, making it a practical replacement when the original cap is worn, cracked, or no longer sealing properly. If you are searching for a Gates 31066 oil filler cap for Jeep Wrangler, Jeep TJ, or Dodge Dakota, this part matches the OE-style design used across many older domestic platforms.

This part cross-references Four Seasons 36002 for the same application.

Common Problems This Part Addresses

• Oil cap that no longer seals tightly
• Cracked, warped, or missing filler cap
• Oil odor from vapor escaping at the fill neck
• Contamination entering the engine through an open or damaged cap
• Loose fit on a worn twist-lock oil filler neck

Installation Notes and Tips

Verify the neck diameter, shell diameter, and twist-lock style before installation. Clean the oil fill neck sealing surface before installing the new cap, and confirm the gasket seats evenly. For fitment verification, check your vehicle against the confirmed application list, including 1987-2002 Dodge Dakota, 1997-2002 Jeep TJ and Wrangler, and 1991-1995 Jeep Wrangler. Additional confirmed applications include 1991-1997 Jeep Cherokee, 1999-2000 Jeep Cherokee, and many Chevrolet and GMC truck, van, and SUV models with a metal oil cap.

• Fits 1987-2002 Dodge Dakota, N/A
• Fits 1997-2002 Jeep TJ, N/A
• Fits 1997-2002 Jeep Wrangler, N/A
• Fits 1991-1995 Jeep Wrangler, N/A
• Fits 1991-1997 Jeep Cherokee, N/A
• Fits 1999-2000 Jeep Cherokee, N/A

Quality Assurance

Gates manufactures this oil filler cap with metal and rubber materials and an included seal for OE-style serviceability. The OE Exact rating indicates a factory-style replacement approach for the listed applications. Part number 31066 is backed by Gates product engineering standards for replacement engine hardware.