Mercury Manual-Operator - 90-10237081. The Mercury Manual-Operator - 90-10237081 is an original equipment manufacturer (OEM) guide designed to help Mercury engine owners operate their equipment safely and effectively. This manual delivers clear, precise instructions directly from Mercury, ensuring your engine is run according to factory specifications.. Key Features. Genuine OEM Manual - Authored and approved by Mercury for guaranteed accuracy. Detailed Operation Procedures - Covers starting, sh