Keep your engine running longer and stronger with this genuine OEM factory original equipment for use in most power trim and power steering systems on Mercury, Mariner, Force Outboards, and Mercruiser sterndrives. There is no need to drain the system before using this fluid as it will readily mix with the existing fluid. This is not recommended for use in systems that specify SAE 0W-30 oil. See your engine service and maintenance manual for specific applications and maintenance schedules