Mercury – Extreme Performance Gear Lube | High-Load Gear Protection | 85W-90 Marine Formula | 8M0111677

Overview

There’s a certain peace that settles in when you know your gearcase is protected, even when you’re pushing the boat hard. Whether you’re running wide-open across open water or easing into a tight marina after a long day, you can feel the difference when your lower unit is properly lubed. Everything feels smoother, quieter, more controlled. That’s the confidence this Quicksilver Extreme Performance Gear Lube delivers — the kind of trust that lets you enjoy the ride instead of worrying about what’s happening below the surface.

Key Features

• Heavy-duty 85W-90 gear lube designed for outboard and sterndrive racing applications
• Suitable for high-performance gearcases in marine, powersports, and motorsports equipment
• Tackifiers and pressure-resistant additives enhance oil film adhesion
• Advanced emulsifiers offer protection even if water enters the gear housing
• Resists breakdown during high-temperature, high-load operation
• Change annually during winterization or every 100 hours of use

Engine & Boat Compatibility

• Ideal for high-horsepower Mercury outboards using performance gearcases
• Compatible with MerCruiser sterndrives that require heavy-load gear lubrication
• Perfect for bass boats, performance center consoles, offshore rigs, ski boats, and racing applications
• Also suited for gearcases in select powersports and motorsports setups requiring extreme protection

Performance & Practical Benefits

Gear lube might not be the first thing you think about when you launch, but you can absolutely feel the difference when it’s doing its job right. With this 85W-90 formula, the gears stay coated with a tight, clinging film that doesn’t wash away under pressure. Throttle response feels more immediate, shifting stays smooth, and the lower unit runs cooler even during long, demanding runs.

This gear lube is built to withstand real-world punishment — heat, heavy loads, high RPM, and sudden acceleration. The tackifiers help the oil cling to metal surfaces, creating a cushion that protects gear teeth from wear, while the emulsifiers step in if water ever sneaks past a seal. Instead of foaming or thinning out, the formula holds steady, giving your engine the secure protection it needs. Maintaining it is simple too: change it at winterization or every 100 hours, and your gearcase stays healthy for the long haul.

Why Buy OEM

You can grab off-brand gear lube almost anywhere, but when you’re trusting it to protect thousands of dollars’ worth of mechanical parts, the smart move is sticking with Mercury Marine’s original formula. Part number 8M0111677 is developed and tested to match Mercury’s exact performance standards — not “close,” not “compatible,” but correct. OEM gear lube means fewer breakdowns, less wear, and a gearcase that runs the way Mercury designed it to. If you push your boat hard, run long days, or just want reliable protection, this is the kind of product you buy once and never question again.

FAQ

Q1: Which engines or systems does this gear lube fit?

It’s designed for high-performance Mercury outboards and MerCruiser sterndrives, as well as racing and performance gearcases.

Q2: What makes it better than aftermarket gear lube?

The tackifiers, emulsifiers, and pressure additives are engineered specifically for Mercury gearcases, offering superior adhesion and high-temperature stability.

Q3: How do I know if it’s the right lube for my setup?

Check your owner’s manual and confirm compatibility with Mercury Marine part number 8M0111677.

Q4: Can it be used in saltwater and freshwater?

Yes — it performs reliably in both environments.

Q5: Is maintenance simple?

Absolutely. Change once a year during winterization or every 100 hours of use.