Abstract: An oil filter apparatus including a disc element (16) operable to be releasably mounted between a conventional oil filter cannister (14) and a machine (10) to be lubricated. The disc element has generally mutually parallel and opposing end surfaces (50, 52) operable to be mounted between the machine and the oil filter and abut against and sealingly engage with compatible surfaces on both members. The disc element (16) includes a first disc passage (56) extending between the opposing surfaces of the disc and being in fluid communication between a first oil passage (3) carrying oil under pressure within the machine to be lubricated and the inlet side of an oil filter element. A second disc passage (58) extends between the opposite surfaces of the disc and is in fluid communication with an oil outlet port (40) of the filter element and a second oil passage (42) of the machine downstream of the first oil passage.

Abstract: An electronic oil filter apparatus comprising an oil filter (20) and a bypass valve (22). Pressure build up within the filter (20) caused by clogging of the filter results in opening the bypass valve (22) allowing dirty oil to flow around the filter. When the valve is actuated in response to excess pressure build up, a low voltage switching device allows current to flow to a signal means (74) thereby indicating a need to change the filter.

Abstract: An electronic oil filter apparatus in which an electrically conductive probe is mounted within an oil filter canister and is responsive to pressure build up on a bypass valve within the oil filter. The pressure build up is caused by clogging of the filter which eventually results in opening the bypass valve allowing dirty oil to flow around the filter. When the valve is actuated in response to excess pressure build up, a low voltage switching device allows current to flow to a signal means thereby indicating a need to change the filter.