Extending Hydraulic and Engine Oil Life on Trucks THE PROBLEM Harvard Corporation recently worked with the Solid Waste Management Department of a large U.S. City. The goal of the project was to extend the hydraulic and engine oil life on their trucks. The Department was noticing that they were spending a lot of time and money changing engine oil every month, and also changing hydraulic oil on a yearly basis. They wanted a way to control and contain contamination (solids and moisture) from getting into the hydraulic and engine oils. This could be done by reducing contaminants ingression and improving filtration. Here were their targets to accomplish: 1. Extend engine oil change from 1 month to every 3 months 2. Extend hydraulic oil change from 1 year to every 4 years 3. Reduce repair expens

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