90101-ZW9-003 Oil Check Bolt - Overview. The 90101-ZW9-003 Oil Check Bolt is an essential component supporting the oil system in Honda marine engine systems. It is designed to allow easy checking of engine oil levels while sealing the oil pan, preventing leaks, and maintaining engine integrity. Manufactured to precise OEM specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Genuine OEM Honda Oil Check Bolt designed for Honda marine engines.. Primary function is to seal the oil pan and facilitate accurate oil level checking.. Manufactured to meet exact factory specifications, dimensions, and tolerances.. Ensures a secure, leak-proof seal supporting engine reliability.. Built to withstand the harsh demands of marine environments, resisting corrosion and wear.. Integrates cleanly with existing hardware and engine components for easy maintenance.. Why Choose Genuine OEM. Using original Honda parts like the 90101