Mercury – 160°F Thermostat Kit | For V6 & V8 MerCruiser Engines (1987–2016) | 807252T5

Overview

A dependable thermostat is essential for keeping your engine running at the right temperature. The Mercury Marine 807252T5 Thermostat Kit is designed for V6 and V8 MerCruiser sterndrive and inboard engines built by General Motors between 1987 and 2016 with standard cooling systems. Engineered to open at 160°F, it ensures steady cooling and efficient operation while protecting your engine from overheating or running too cold. Built with marine-grade materials, it’s a durable OEM replacement that keeps your cooling system performing exactly as Mercury intended.

Key Features

• Purpose: Controls engine temperature for consistent cooling and performance.
• Temperature Rating: Opens at 160°F for balanced operation and efficiency.
• Compatibility: Fits GM-built V6 and V8 MerCruiser engines (1987–2016) with standard cooling systems.
• Complete Kit: Includes thermostat, O-rings, and multiple gaskets for easy installation.
• Ease of Use: Direct OEM replacement — installs with common hand tools.

Engine & Boat Compatibility

• V6 and V8 MerCruiser sterndrive and inboard engines by General Motors (1987–2016)
• Designed for standard cooling systems

Performance & Real-World Benefits

The 807252T5 thermostat keeps your engine within its ideal operating range — not too cold, not too hot. This ensures better fuel economy, smoother idle, and optimal performance whether you’re cruising or pushing hard offshore. A failing thermostat can cause inconsistent engine temperature, poor fuel efficiency, or even overheating.

This OEM replacement restores reliable cooling control. Made to Mercury’s exact specifications, it resists corrosion and heat degradation, ensuring consistent performance in demanding marine environments. The included seals and gaskets simplify installation, giving you everything you need in one box.

Why Choose Mercury OEM

The Mercury 807252T5 is a genuine OEM part, built to fit and perform exactly like the original thermostat your engine came with. Aftermarket parts can have inconsistent temperature ratings or poor sealing, which may affect cooling performance.

Mercury OEM thermostats are tested under real marine conditions for temperature accuracy, corrosion resistance, and long-term durability. It’s the same thermostat Mercury-certified technicians use in professional service centers — ensuring your engine stays protected and runs at peak efficiency.

FAQ

Q1: What engines does this fit?
It fits V6 and V8 MerCruiser sterndrive and inboard engines built by General Motors (1987–2016).

Q2: What’s the temperature rating?
This thermostat opens at 160°F, maintaining the correct balance between performance and protection.

Q3: What’s included in the kit?
The kit includes a thermostat, O-rings, and multiple gaskets for a complete replacement.

Q4: Is it easy to install?
Yes — it’s a direct-fit replacement that can be installed with standard tools.

Q5: Why use OEM instead of aftermarket?
Because Mercury OEM parts are engineered for precise temperature control, fitment, and reliability that aftermarket versions can’t guarantee.