Series 50 – Section 3 Lubrication System Section 3 Lubrication System 3.1 Overview of Lubricating System 3.2 Oil Pump 3.3 Oil Pressure Regulator Valve 3.4 Oil Pressure Relief Valve 3.5 Oil Filter 3.6 Oil Filter Adaptor 3.7 Oil Cooler 3.8 Oil Level Dipstick Assembly 3.9 Oil Pan 3.10 Ventilating System