ACDelco GM Original Equipment FC208 (12573337) Engine Oil

The ACDelco GM Original Equipment FC208 (12573337) Engine Oil Filler Cap seals your engine's oil fill opening with GM-specified fit and a rubber gasket to prevent leaks and contamination.

This replacement oil filler cap is designed as a direct-fit component for many GM vehicles, built to the same specifications as the factory-installed part. It restores the factory sealing performance at the oil filler neck, helping keep engine oil and crankcase vapors contained while blocking moisture and road grime from entering the engine. Manufactured to GM Original Equipment standards, the FC208 (12573337) cap aims to deliver reliable service life and correct fitment so routine maintenance remains simple and secure.

What does the ACDelco FC208 cap do for my engine?

The cap closes and seals the oil filler opening so oil and crankcase vapors stay inside the engine while contaminants stay out. Its rubber sealing ring compresses to form a tight barrier; the threaded or quarter-turn interface matches the vehicle's filler neck for proper engagement.

• Prevents oil seepage and reduces the risk of messy leaks around the filler neck
• Contains crankcase vapors to preserve engine ventilation systems
• Blocks water and dirt from entering the oiling system
• Fits GM-specified filler necks for correct alignment and rotation

How is this cap different from generic replacements?

ACDelco GM Original Equipment caps are produced to the automaker's fit, form, and function criteria rather than generic standards. That means the materials, sealing geometry, and engagement method mirror what GM used at the factory, which improves reliability and reduces the chance of fitment problems or premature wear.

• Made to GM OE specifications for consistent dimensions and performance
• Uses a durable rubber sealing ring matched to the original design
• Minimizes the need for modification or workarounds at installation

How do I install and maintain the FC208 oil filler cap?

Installation is quick: align the cap with the filler neck, then thread or quarter-turn until it seats snugly against the seal. Regular checks during oil changes or routine inspections ensure the seal remains intact and the cap threads are free of debris; replace the cap if the rubber ring shows cracking or compression loss.

• Clean the filler neck before fitting to avoid trapped grit
• Hand-tighten until fully seated—do not over-torque to prevent damage
• Inspect the rubber seal periodically and replace the cap if degraded

Will this cap fit my GM vehicle?

The FC208 (12573337) is a GM-recommended replacement for specific models and years; verify compatibility with your vehicle’s parts catalog or VIN lookup. When matched correctly, it replicates the factory cap’s engagement style and sealing surface for a direct replacement experience.

• Check part number 12573337 or FC208 against your vehicle's compatibility list
• Confirm neck type (threaded vs. quarter-turn) to ensure proper fit
• Use dealer or online VIN lookup tools if unsure about fitment details

Who this is for: Drivers and DIY mechanics who want a straightforward, factory-spec replacement for a worn or missing oil filler cap on compatible GM vehicles. It’s appropriate for routine maintenance, restoration projects, and anyone who prefers original-equipment parts to preserve factory performance and long-term reliability.