Abstract: An automatic oil additive injector is disposed over the drain opening in a bottom wall of an engine oil pan and extends into the oil pan. A side port is provided in a housing of the injector for allowing oil to drain therethrough when the oil drain plug is removed. Primary and secondary valve assemblies and a pump operator provided in the housing are activated upon removal of the drain plug to allow a chamber therebetween to fill with a predefined volume of additive, preferably silicone fluid, from a reservoir of the injector and which, upon engagement of the drain plug, dispense the fluid into the oil pan at each oil change to decrease aeration of the oil. In a second embodiment, the additive injector and reservoir are incorporated in the lubricating oil filter header.

Abstract: A diesel engine having a lubricating oil sump and a low pressure lubricating oil pump, is provided with a hydraulically-operated, electronically-controlled unit fuel injector operating system of the type having a unit fuel injector, a high pressure pump, a high pressure lubricating oil supply passage from said pump to said unit injector, a fuel supply to said unit injector, and an electronically controlled valve in said unit injector for controlling the application of the pressure of the lubricating oil to force said fuel to be expelled from said injector, wherein a priming reservoir is operatively connected to the low pressure lubricating oil pump and disposed upstream and above the high pressure supply pump and above the high pressure supply passage, preferably being disposed in the engine front cover and having a restricted return line to the oil sump for venting air from said reservoir, a siphon passage establishes fluid communication between said reservoir and said high pressure passage independently of