Keyser Manufacturing Auxiliary oil coolers feature a stacked plate design, allowing every inch of material to function as a cooling surface. The embossed plates maintain excellent performance with a very low pressure drop. Deck-mount models can cool a variety of lubricants, including engine, transmission, and differential oil; and power steering, hydraulic, and transmission fluid. Small enough to mount virtually anywhere, but engineered to out perform standard oil coolers, Keyser Manufacturing has the right choice for your ride.