Genuine OEM Audi Oil Filler Cap, part number 420103485B. This cap provides a secure seal for the engine's oil filler opening, preventing contaminants from entering the engine and ensuring no oil escapes. It is a vital component for maintaining engine cleanliness and proper lubrication. Weighing approximately 0.094 kg, it is designed for a precise fit. Choosing a genuine OEM oil filler cap guarantees the correct sealing properties and material durability, which are essential for protecting the engine from environmental elements and maintaining oil integrity.