Genuine OEM Volvo Manual Gearbox Oil, part number 1161645. This fluid lubricates and cools the manual gearbox, ensuring smooth operation. It is specifically formulated for manual transmissions. The SAE 75W API GL-4 rating indicates its viscosity and performance characteristics. Genuine OEM fluids are critical for maintaining the precise tolerances and material compatibility within your vehicle's gearbox, ensuring optimal performance and longevity.