Sierra Hi-Performance Synthetic Gear Lube - Available in 10 Oz Tube to 5 Gallon
Sierra Hi-Performance Synthetic Gear Lube - Available in 10 Oz Tube to 5 Gallon
Sierra Hi-Performance Gear Lube is a synthetically blended marine gear lubricant engineered to reduce operating friction and protect gears, bearings, and other lower unit components. It is GL-5 rated and formulated for high performance and high load operating conditions in both outboard and I/O lower units, designed to surpass the performance of the original equipment Hi-Performance gear lubricants it replaces. The same synthetic blend chemistry is offered across four package sizes so boaters and technicians can buy the format that matches the job at hand: a 10 ounce tube for a small top-off, a quart bottle sized for a standard lower-unit gear case change, a quart pump kit that bundles the gear lube with a pump and adapters for cleaner, no-mess application, and a 5 gallon container for shops and high-volume service work. The quart size is built to replace Mercury (Quicksilver) Hi-Performance Blend, OMC (System Matched) Ultra-HPF Blend, and Yamaha (Yamalube) LUB-GEARL-11-00 gear lubricants. Whichever size is selected, the lubricant meets GL-5/SAE 20W viscosity requirements for demanding marine gear case service.
Specifications
- Brand: Sierra
- Manufacturer Part Number: 18-9650
- Product Type: Lower Unit Gear Lube
- Viscosity Rating: GL-5
- SAE Viscosity Grade: 20W
- Material: Synthetic Blend
- Item Form: Liquid
- Country of Origin: United States
- Recommended Use: High performance and high load outboard and I/O lower units
- OEM Cross-Reference: Mercury 92-858064Q01 (Quart size), Mercury 92-858008Q01 (5 Gallon size)
- Available Sizes: 10 Ounce Tube, Quart, Quart Pump Kit, 5 Gallon
- Warranty: Limited Warranty
Sizes & Options
This line is sold by Size. Pick the 10 Ounce Tube for topping off a lower unit between changes, the Quart for a complete standard lower-unit gear case fill, the Quart Pump Kit if you want the gear lube packaged with a pump and adapters for a cleaner fill, or the 5 Gallon container for shops and boaters servicing multiple units.
Frequently Asked Questions
What is Sierra Hi-Performance Gear Lube used for? It is a synthetic blend marine gear lubricant used in outboard and I/O lower units, where it reduces operating friction and protects gears, bearings, and other gear case components under high performance and high load conditions.
Is this gear lube GL-5 rated? Yes, Sierra Hi-Performance Gear Lube is GL-5 rated with an SAE 20W viscosity grade, meeting the specification level required for demanding marine gear case applications.
Which size should I buy for a lower unit service? For a full lower-unit gear case change, the Quart size is the standard fill volume; use the 10 Ounce Tube only for topping off, and choose the 5 Gallon container if you are servicing multiple units or run a shop.
What does the Quart Pump Kit include? The Quart Pump Kit (SIE-18-9650-2QP) bundles a quart of Sierra Hi-Performance Gear Lube with a pump and adapters, allowing the gear case to be filled without a separate application tool.
Does this gear lube replace Mercury Hi-Performance gear lubricant? Yes, the Quart size gear lube is built to replace Mercury (Quicksilver) Hi-Performance Blend, and the Mercury OEM number it replaces is 92-858064Q01.
Is there a cross-reference number for the 5 Gallon size? The 5 Gallon container of Sierra Hi-Performance Gear Lube replaces Mercury 92-858008Q01.
Does this gear lube also replace OMC or Yamaha gear lubricants? The Quart size is designed to replace OMC (System Matched) Ultra-HPF Blend and Yamaha (Yamalube) LUB-GEARL-11-00 in addition to the Mercury equivalent.
Is Sierra Hi-Performance Gear Lube synthetic? It is a synthetically blended formulation, not a conventional mineral gear oil, which is part of how it reduces operating friction versus standard gear lubricants.
Can this gear lube be used in both outboard and I/O lower units? Yes, Sierra Hi-Performance Gear Lube is formulated for use in high performance and high load operating conditions in both outboard and I/O lower units.
How is the 10 Ounce Tube packaged? The 10 Ounce size ships as a tube, sized for topping off a gear case rather than a full fluid change.
Is this an OEM or aftermarket gear lube? Sierra Hi-Performance Gear Lube is an aftermarket formulation engineered to surpass the performance of the original equipment Hi-Performance gear lubricants it cross-references to, such as the Mercury 92-858064Q01 and 92-858008Q01 equivalents.
What comes in the box with the Quart Pump Kit? The SIE-18-9650-2QP kit contains one quart of Sierra Hi-Performance Gear Lube along with a pump and the adapters needed to apply it to a lower unit gear case.