Systems for in situ monitoring of working fluids and working fluid systems

An oil filter adapter assembly for monitoring oil parameters of a lubrication system of an engine, the engine having an oil filter stud and an associated oil filter, the oil filter adapter assembly comprising:

• an adapter having a body having a proximal face and a distal face, the proximal face sealingly engageable with the engine and the distal face sealingly engageable with the associated oil filter, the adapter further having a central bore and an annular passageway, the annular passageway being configured to fluidly couple the lubrication system of the engine and the associated oil filter and receive oil therein;
• and a fastener having a body defining a retaining feature, the fastener having a proximal end and a distal end, the proximal end having a threaded portion configured to threadedly engage the oil filter stud of the engine such that the retaining feature captures the adapter and retains the adapter in sealing engagement with the engine, the distal end having a threaded portion configured to threadedly engage the associated oil filter, the fastener further having a central oil passageway being configured to fluidly couple the lubrication system of the engine and the associated oil filter and receive oil therein, a first pressure port fluidly extending from an exterior of the fastener to the central oil passageway, the first pressure port configured to be operably coupled to a sensor via a communication port in fluid communication with the first pressure port.