Quicksilver SAE 90 Gear Lube & Hand Pump Kit, 32 oz — Marine Lower-Unit Oil with EP and Corrosion Protection

Quicksilver SAE 90 High Performance Gear Lube & Pump Kit is a 32 oz marine-grade lower unit oil packaged with a hand pump to help protect outboard and sterndrive gear cases from wear, corrosion, and water-related damage.

Regularly changed gear oil is one of the simplest ways to extend the life of your boat’s lower unit. This Quicksilver kit pairs a 32-ounce bottle of SAE 90 gear lube formulated for marine lower units with a hand pump sized for drains and fill fittings that use a 3/8-16 thread. The lubricant is developed to meet Mercury Marine OEM specifications and includes extreme-pressure synthetic additives to reduce metal-to-metal contact and resist contamination from water ingress.

How does this gear lube protect lower units during normal boating?

The SAE 90 formula provides a thick viscous film that cushions gear surfaces, minimizing friction under load. Synthetic extreme-pressure additives help the oil maintain protective properties when temperatures and mechanical stress increase. Corrosion inhibitors fight rust and pitting when moisture or saltwater exposure occurs, preserving internal components between service intervals.

• SAE 90 viscosity for a stable lubricating film under load
• Extreme-pressure additives to reduce wear on gear teeth and bearings
• Corrosion inhibitors to guard against moisture and saltwater damage
• Produced to meet Mercury Marine OEM specifications for compatibility

Why is the included pump useful for changing lower unit oil?

The hand pump is sized to fit most outboard and sterndrive lower unit fill/drain ports that accept a 3/8-16 threaded fitting, letting you remove and install fluid without tipping the engine or making a mess. Using the pump reduces spills, speeds the job, and lets you precisely control fluid volumes for a proper fill. It’s practical for at-dock maintenance and winterization tasks.

• Fits 3/8-16 thread drain/fill screws on many outboards and sterndrives
• Enables cleaner, faster oil extraction and refill
• Reduces need to tilt or invert the lower unit during service
• Compact for storage aboard or in a tools kit

Can this oil withstand water contamination or heavy loads?

This high-performance SAE 90 gear lube is formulated with additives aimed at maintaining protection even when trace water mixes into the housing. While no lubricant can fully eliminate damage from large amounts of water, the corrosion inhibitors and EP chemistry improve resistance to failure modes caused by moisture and heavy mechanical loads. Regular inspection and timely fluid changes remain important to preserve gear integrity.

• Formulation helps resist light water contamination effects
• EP additives reduce the risk of metal-to-metal contact under heavy load
• Helps prevent pitting and corrosion when moisture is present
• Recommended replacement intervals maintain peak protection

Who is this kit best suited for? Boaters, marinas, and service technicians who maintain outboard motors and sterndrives on vessels above 75 hp will benefit most from this product. It’s especially useful for owners who prefer OEM-spec fluids and want an all-in-one solution that includes a correctly sized pump for lower unit service. If you operate in saltwater or run your boat hard, choosing a gear lube designed and produced to meet Mercury Marine specifications offers compatibility and peace of mind without compromising performance.