Genuine Mercruiser 8M0089715 140 Degree Thermostat Genuine Mercruiser 60 C, 140 degree F thermostat suitable for a huge range of Mercruiser inboards from 3.0 to 454 big block. Replaces: 18-3551, 13030, 9-43013, 59137A1, 8052731, 8072521, 807252T1 and...