NLWM930

Im not at work at the moment so i cant remember what model mack engine this truck has...but it keeps overflowing the power steering resivour. We put about 300+ mile a day local hauling on our trucks...about every 2 months we have to take a quart or so of oil out of the power steering. Trucks are serviced every 3000, oil changed every 4th service. This is an older mack...right now not even sure what year.