ACDelco Engine Oil Filler Cap FC208 (12573337) — GM OE Direct-Fit with Rubber Seal

ACDelco GM Original Equipment FC208 (12573337) Engine Oil Filler Cap is a direct-fit replacement cap that seals the engine oil fill opening and protects the crankcase from leaks and contamination. This engine oil filler cap is made to GM Original Equipment specifications to restore the fit, function, and durability of your vehicle’s factory part. It includes a molded rubber sealing ring that traps oil and crankcase vapors inside while keeping dirt, moisture, and road contaminants out. Whether you’re replacing a lost cap or renewing a worn seal after service, this ACDelco cap aims to match the performance of the component installed at the factory.

How does this cap prevent oil leaks and contamination?

The cap uses a threaded or quarter-turn closure and an integrated rubber gasket to create a tight barrier at the oil fill opening. A correct seal keeps oil from splashing or weeping out and prevents external debris and water from entering the crankcase area.

• Molded rubber sealing ring for consistent compression and sealing
• Precision fit to GM OE dimensions to avoid gaps or misalignment
• Robust closure (threaded or quarter-turn) to resist loosening from vibration

Will this cap fit my GM vehicle and how does it compare to the original?

This ACDelco cap is manufactured to meet GM Original Equipment standards and is intended as a direct replacement for the factory-installed part it supersedes. It matches the original in size, sealing design, and service life expectations, so installation and performance are comparable to the component shipped with the vehicle.

• Supplied to GM OE specification for fit, form, and function
• Part number FC208 (12573337) corresponds to specific GM models—verify fit by part number
• Quality and durability aligned with GM-recommended replacement parts

How do I install or inspect the oil filler cap during routine maintenance?

Installation is straightforward: remove the old cap and thread or press this cap into the oil fill opening until snug. Inspect the rubber seal for cracks or deformation and clean the fill neck to ensure a consistent seal; replace the cap if the gasket is damaged or the closure feels loose.

• Hand-tighten until the cap seats firmly—no tools required for typical caps
• Check the rubber gasket for wear, hardening, or tears before installing
• Wipe the oil fill neck clean to remove sludge and old oil that can prevent sealing

What are the practical benefits of choosing this ACDelco GM OE cap?

Using a cap built to OE specifications helps maintain proper crankcase ventilation and prevents oil loss and contamination that can affect engine cleanliness. It also preserves the vehicle’s original engineering intent and reduces the chance of fitment issues common with generic aftermarket caps.

• Helps maintain engine bay cleanliness by reducing oil seepage
• Protects internal components from moisture and debris intrusion
• Offers the reliability expected for scheduled maintenance and repairs

Who is this for: This ACDelco FC208 (12573337) Engine Oil Filler Cap is aimed at GM owners, mechanics, and DIY enthusiasts who need a dependable, factory-spec replacement cap. It’s appropriate for anyone replacing a missing or worn oil filler cap, rebuilding an engine, or performing routine service and wanting the assurance of GM-approved fit and sealing performance.

FAQ

Q: Is the FC208 (12573337) cap an original GM part?

A: Yes. The FC208 (12573337) is an ACDelco part made to GM Original Equipment specifications.

Q: Can I install this cap myself?

A: Yes. It installs by hand—remove the old cap, clean the fill neck, and tighten until seated.