This is a genuine CORTECO oil filler cap, part number 220155S. It is designed to provide a tight and secure seal for your vehicle's oil filler opening, preventing contaminants from entering the engine and oil from escaping. A properly functioning oil filler cap is crucial for maintaining engine health. It works in conjunction with the crankcase ventilation system to manage internal engine pressures. A damaged or missing cap can lead to oil leaks, increased oil consumption, and potential engine damage due to dirt and debris ingress. CORTECO is known for producing high-quality sealing solutions for the automotive industry. This oil filler cap is manufactured to meet or exceed original equipment specifications, ensuring a perfect fit and reliable performance. Replacing a worn or damaged cap with this CORTECO part will help maintain your engine's integrity and prevent costly repairs.