This gear oil is especially popular among enthusiasts restoring or maintaining historic vehicles, like mid-1930s to early-1950s synchro-equipped gearboxes in cars and trucks. Its formulation lacks friction modifiers, which allows it to balance slipperiness for specific applications or be mixed with additives like 75W90NS or MT-90 to increase viscosity, helping reduce noisy or rough shifting in older or troubled A-833 Dodge/Plymouth 4-speed transmissions from 1964 to 1969.
