The pursuit of increased power output and durability does not stop at the flywheel. The engineering staff at Joe Gibbs Racing looks for every possible advantage, and Joe Gibbs Driven lubricants deliver measurable performance gains in transmissions, rear gears, and power steering systems. Used by Joe Gibbs Racing in every rear end differential, this unique synthetic gear oil reduces operating temperatures by up to 15F compared to other brand gear oils. Viscosity typical of SAE 75W-110.