Mercury – Automatic Transmission Fluid | Marine DEXRON III Formula | 1 Gallon | 8M0173230

Overview

Anyone who spends real time on the water knows there’s a difference between products designed for land vehicles and those built from the ground up for marine life. Mercury Automatic Transmission Fluid 8M0173230 falls squarely into that second category. It’s made for the long days, the towing loads, the tight maneuvering in a crowded marina, and the quiet confidence you feel when your transmission shifts cleanly every time.

Whether you’re running Tow Sport sessions at dawn or cruising past sunset, having the right ATF behind your throttle makes life easier. This gallon jug gives you the volume you need for full fluid changes, plus the peace of mind that comes from using a fluid engineered specifically for the punishment marine transmissions endure.

Key Features

• Meets DEXRON III requirements for broad Mercury and MerCruiser compatibility
• Resists heat breakdown for steady, reliable lubricity under load
• Low-viscosity design supports fuel efficiency and smooth shift response
• Formulated for extreme marine temperatures and shifting conditions
• Durable protection against wear, scoring, and internal corrosion
• Produced to Mercury Marine OEM specifications for fit, reliability, and longevity

Engine & Boat Compatibility

Ideal for systems requiring DEXRON III automatic transmission fluid, including:

• Mercury and MerCruiser inboard and sterndrive transmissions
• Outboards equipped with transmission systems using ATF
• Tow Sport boats needing consistent hydraulic shift performance
• Family runabouts, fishing boats, pontoons, and sport cruisers with DEXRON III requirements

Performance & Practical Benefits

Transmission performance on the water isn’t the same as in a road vehicle. You’re constantly adjusting speed, slipping into neutral at the dock, hammering the throttle for tow sports, or holding steady at cruising RPM. That kind of use builds heat fast—and heat kills fluid.

This Mercury gallon ATF is engineered to hold its lubricity even when temperatures soar. Shifts stay tight, smooth, and responsive, without slipping or hesitation. The formula’s resistance to thermal breakdown means your internal components—valves, seals, gears—stay protected through long hours and heavy loads.

The low-viscosity blend also helps your engine and transmission operate more efficiently. Over time, that translates to reduced wear and steadier performance, especially in boats that regularly run high-load activities like towing or long-distance cruising.

With a full gallon on hand, you’ll have plenty for complete changes and top-offs, making routine maintenance easier and more cost-efficient over the lifespan of your boat.

Why Buy OEM

Choosing genuine Mercury fluids is less about branding and more about ensuring your equipment gets exactly what it was engineered for:

• Formulated specifically for Mercury transmissions
• Withstands marine heat and moisture better than generic ATF
• Long-term reliability with fewer performance drop-offs
• Designed to protect seals, hoses, and internal components Mercury uses
• Helps maintain peak shifting performance and system longevity

It’s the kind of practical decision seasoned boaters make because they know it saves money—and headaches—in the long run.

FAQ Section

Q1: Which Mercury systems does this product fit?

Any outboard, inboard, or Tow Sport transmission calling for DEXRON III fluid.

Q2: What makes it better than automotive ATF?

Marine transmissions see higher heat, constant load changes, and moisture—this fluid is engineered specifically for that environment.

Q3: How do I confirm it’s the right fluid for my setup?

Check your owner’s manual; it will list DEXRON III if this fluid is required.

Q4: Can it be used in both freshwater and saltwater boats?

Absolutely. It’s formulated to handle corrosion and moisture exposure in either environment.

Q5: Is fluid replacement straightforward?

Most boat owners can handle it with basic tools and their manual’s guidance.