Engineered Marine Products 75-75012 Thermostat for Mercury Optimax DFI 200-250 HP

The Engineered Marine Products 75-75012 is a precision-engineered thermostat designed specifically for Mercury and Mariner Optimax DFI outboard motors. This aftermarket replacement thermostat ensures proper engine temperature regulation for 3.0L V6 outboards in the 200, 225, and 250 horsepower range.

Key Features:

• Direct replacement for Mercury 8M0057307, 885599004, 885599003, and 8855991
• Compatible with Sierra part number 18-3535
• Designed for 2000-2014 Mercury Mariner V6 outboards (200-300 HP)
• 130-degree temperature rating optimized for DFI engine cooling systems
• Precision-manufactured to OEM specifications for reliable performance
• Helps maintain optimal engine operating temperature and prevents overheating

This thermostat is engineered to withstand the demanding marine environment and maintain consistent coolant pressure throughout the engine's RPM range. Proper thermostat function is critical for fuel efficiency, emissions control, and long-term engine reliability on Optimax DFI outboards.