Gear oil is a lubricant made specifically for transmissions, transfer cases, and differentials in automobiles, trucks, and other machinery. It is of a higher viscosity to better protect the gears and usually is associated with a strong sulfur smell. The high viscosity ensures transfer of lubricant throughout the gear train. This is necessary since the devices needing this heavy oil do not have pumps for transferring the oil with only a portion of the lowermost gears bathed in an oil sump. This heavy oil can create viscous drag leading to inefficiencies in vehicle operation. Some modern automatic transaxles (integrated transmission and differential) do not use a heavy oil at all but lubricate with the lower viscosity hydraulic fluid, which is available at pressure within the automatic transmission.
MANNOL MTF-4 Getriebeoel 75W-80 GL-4 is a new generation synthetic transmission oil for mechanic 5- and 6-speed transmissions for cars from BMW, Volvo, Toyota, Nissan, Mitsubishi, Peugeot, Honda, ZF etc. The modern additive package provides an easy start, a smooth operation of manual transmissions at low temperatures and under high loads, holds excellent anti-foaming properties as well as high thermal stability and is compatible with all types of construction materials. Extends oil change periods. Exceeds most requirements of automotive manufacturers.