91203-ZV5-821 Oil Seal - Overview. The 91203-ZV5-821 Oil Seal is an essential OEM component designed specifically for Honda marine engine systems, particularly in power trim-tilt assemblies. This oil seal plays a critical role in preventing oil leakage and contamination, ensuring proper lubrication and longevity of the engine's internal components. Manufactured to meet Honda's stringent factory specifications, the 91203-ZV5-821 oil seal ensures seamless integration with existing parts, maintaini