This Service Repair Manual covers the Mercury Mariner XR10 MAG10 outboard engine. Designed for marine applications, this engine features a CDI ignition system, water-cooled operation, and electric start. Fuel delivery is either carbureted or EFI, depending on the specific model configuration. The transmission utilizes an outboard gearcase. This manual is provided in English. The purpose of this manual is to provide comprehensive guidance for the maintenance, repair, and troubleshooting of the Mercury Mariner XR10 MAG10 outboard. It includes detailed procedures for routine maintenance tasks such as lubrication with 2-stroke outboard oil, and information on replacement intervals for critical components like spark plugs, water pump impellers, and gearcase oil. Technical data, including wiring diagrams and a troubleshooting guide, is also included to assist owners, mechanics, and technicians in ensuring the optimal performance and longevity of the engine.