Automatic crankcase oil change and makeup system

摘要: Method and apparatus for automatically changing engine lubricating oil while the is running, in which small increments of used are periodically removed from system, substantially simultaneously with removal each increment oil, a corresponding fresh delivered to so volume system not reduced by removal. Oil sump level sensing determines destination that removed. If below predetermined satisfactory operating when an removed, fuel tank burnoff diesel engines, or holding other normal change mode operation. If, however, level, then back makeup Actuation timing microprocessor otherwise electronically controlled. The may include multiple probes at various spaced apart locations fluid communication sump. generate plurality signals indicative levels such locations, can be develop average signal representative all orientations engine. A variety probe types sensors described.