40105-ZV4-000 Oil Case Grommet - Overview. The 40105-ZV4-000 Oil Case Grommet is an essential sealing component within the oil case system of Honda marine engine systems. This grommet acts as a durable barrier that prevents oil leaks and contamination ingress, ensuring that the oil case remains sealed and protected for optimal engine performance and longevity. Designed specifically for Honda marine engines, it guarantees seamless integration with existing parts, maintaining optimal performance a