Bel-Ray Big Twin Transmission Oil 85W-140 1 Liter

Bel-Ray Big Twin Transmission Oil 85W-140 1 Liter

Every time you grab a gear on a Big Twin, the transmission oil determines how cleanly it goes in and how quietly the gears settle. Engineered specifically for the separate transmission compartment of Big Twin drivetrains, this 85W-140 mineral gear oil makes neutral easier to find, quiets gear whine, and eliminates the clunk that worn or incorrect fluid leaves behind.

Key Features

• Multi-grade formulation engineered for heavily loaded 4-stroke Big Twin transmissions and final drives
• Recommended for 4, 5, and 6-speed Big Twin transmissions
• Formulated for separate gearboxes without a wet clutch — not for primary chaincase use
• Extreme pressure additives reduce component wear and extend gear service life
• Quiets gear whine and improves shift quality throughout the rev range
• Makes neutral easier to find and reduces common V-Twin transmission clunk
• Distinctive red color for quick leak detection in multi-cavity drivetrains

Technical Specifications

• OEM Part Number: 96900-BT1
• Oil Type: Mineral gear oil
• Viscosity: SAE 85W-140
• Rating: API GL-5
• Application: Big Twin separate transmission and final drive
• Volume: 1 Liter

Fitment Notes

• For all Harley-Davidson Big Twin separate transmission compartments — compatible with 4-speed (1936-1986), 5-speed (1980-2006), and 6-speed (2006-Up) Big Twin models
• Not for Sportster XL models — Sportster uses a combined engine/transmission sump serviced by Bel-Ray V-Twin Sport Transmission Fluid
• Not suitable for primary chaincase use — formulated for gearboxes without a wet clutch; use Bel-Ray V-Twin Primary Chaincase Lubricant for the primary compartment
• Not for use as engine oil