Sierra 18-9600-2 - Premium Marine Gear Lube, 80W-90 GL-5 Quart

Sierra 18-9600-2 - Premium Marine Gear Lube, 80W-90 GL-5, 1 Quart

For lower-unit service requiring an 80W-90 GL-5 lubricant, Sierra 18-9600-2 provides premium-blend marine gear lube in a one-quart bottle. It is formulated for freshwater and saltwater marine applications and designed to protect gears, bearings and internal gearcase components under normal operating conditions. Confirm the lubricant specification for the actual gearcase before selecting it; brand name or viscosity alone does not establish suitability for every drive.

Part Specifications

• Part Number: 18-9600-2
• Lubricant: Premium-blend marine lower-unit gear lube
• Viscosity: 80W-90
• Listed Lubricant Class: GL-5
• Container Size: 1 quart
• Color: Amber
• Listed Use: Compatible freshwater and saltwater marine lower units
• Listed Replacement Lubricants: Mercury Quicksilver Premium Blend; OMC Hi-Vis; Yamaha Yamalube LUB-GEARL-11-04
• Replacement References: Mercury 92-858058Q01; Bel-Ray 99735-BT1; Mallory 9-82401

The optional Sierra 18-9781 quart-bottle gear lube pump is sold separately. Its listing includes a flexible fill line and a fitting for domestic lower units; verify the required fill-port fitting for your gearcase.

Confirm Fitment Before Ordering

Use the parts diagrams available on our website to identify your lower unit, then check its specified lubricant in the applicable manual. Alternatively, send us your engine and drive model and serial number by email, text or live chat, and we'll confirm suitability before you order; include details of any replacement gearcase.

Additional Information

• Vendor: Sierra
• Part Number: 18-9600-2
• OEM Cross-Reference: Mercury 92-858058Q01; Yamaha Yamalube LUB-GEARL-11-04 lubricant reference
• Aftermarket Cross-Reference: Bel-Ray 99735-BT1; Mallory 9-82401

Installation Notes

Refer to the applicable lower-unit or sterndrive service manual for lubricant selection, capacity, filling requirements and specified post-service checks.

Frequently Asked Questions

Q: What viscosity and lubricant class are listed?
A: Sierra 18-9600-2 is listed as 80W-90 gear lube for applications requiring a GL-5-class lubricant. Confirm both requirements against the gearcase manual.

Q: Is this the same product as a full-synthetic or high-performance blend?
A: This listing identifies premium-blend gear lube. It does not establish equivalence to every full-synthetic or high-performance lubricant specified by a drive manufacturer.

Q: Is the quart-bottle pump included?
A: No. Sierra 18-9781 is an optional, separately sold pump; confirm its fill fitting suits your lower unit.

Q: Is one quart enough to service my drive?
A: One quart is the bottle size, not a confirmed service capacity for your drive. Check the manual's specified capacity before choosing the quantity to order.

Q: Can it be used in freshwater and saltwater installations?
A: Both environments are listed, provided the gearcase calls for a compatible lubricant. That does not make it universal for every lower unit, transmission or hydraulic system.