Which type of engine air filter utilizes foam rubber coated with oil?

The type of engine air filter that utilizes foam rubber coated with oil is the oil foam filter. This design is particularly effective for capturing dust and dirt particles while allowing air to flow through. The oil coating on the foam acts as a sticky trap that adheres to contaminants, preventing them from entering the engine. This is especially beneficial in off-road or dusty environments, where traditional filters might become quickly clogged and less effective. The oil foam filter is washable and reusable, making it a more durable option compared to disposable paper filters. In applications that require high-performance filtration, such as in sports or racing vehicles, oil foam filters are favored due to their ability to maintain airflow while still providing excellent filtration.