Motorcraft Diesel Engine Oil Fill Cap EC781 — Ford & Lincoln Direct-Fit, OEM-Quality, 2-Year Warranty

When it’s time to replace a lost, cracked or worn oil fill cap, choose a purpose-built option made to match factory fit and function. The Motorcraft EC781 oil cap is designed for diesel applications, manufactured to vehicle-specific tolerances and backed by a two-year, unlimited-mileage warranty that includes labor—helping protect your investment in routine maintenance and repairs.

Will this oil cap fit my Ford or Lincoln diesel?

The EC781 is a vehicle-specific replacement part, intended for certain Ford and Lincoln diesel-powered models. Confirm fitment by checking the EC-781 part number against your vehicle’s parts list or your VIN to ensure compatibility.

• Part number: EC-781 for precise cross-referencing
• Designed for diesel engine oil fill locations
• Vehicle-specific fit — verify with your VIN or dealer parts catalog

How does the Motorcraft cap compare to the original equipment?

Motorcraft parts are developed to meet or closely match factory standards for fit, finish and function. The EC781 reproduces the original cap’s sealing and engagement features so it performs like the component it replaces without requiring modification.

• Engineered for proper sealing to help maintain correct oil system environment
• Manufactured to fit factory oil fill openings and thread or bayonet styles
• Material and molding controlled to provide consistent engagement and durability

What warranty and support come with this replacement cap?

This Motorcraft oil cap is covered by a two-year, unlimited-mileage warranty that also includes labor for warranted defects. The warranty excludes commercial-use exceptions, so it's tailored for typical consumer vehicle use and ownership.

• Two-year unlimited-mileage coverage
• Labor included for warranty repairs where applicable
• No coverage exceptions for standard non-commercial ownership

How do I inspect and install the EC781 oil cap?

Inspect the oil fill opening for debris or damaged sealing surfaces before installing the cap. Installation is straightforward—align, engage threads or bayonet, and hand-tighten until secure; no special tools are required for most applications.

• Clean the fill area and remove old gasket residue
• Align cap and engage threads or bayonet lock by hand
• Check for proper seating and absence of oil leaks after installation

Who this product is for: The Motorcraft EC781 diesel oil fill cap is ideal for Ford and Lincoln owners seeking a factory-style replacement part. It suits DIY enthusiasts replacing a damaged cap, independent shops needing a reliable aftermarket option, and anyone prioritizing warranty-backed components that match original fit and performance. Always verify the EC-781 part number against your vehicle’s compatibility list before ordering to ensure a correct match.