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2 things i would do professionally first. 1. change the oil using a higher weight and a volvo oil filter(there is a difference) 2. have a "wet" gauge installed at the oil pressure sending unit to verify oil pressure from cold to warm. a "wet" gauge is a gauge that reads actuall oil pressure and not the use of electronics. it is usually very acurate. if the oilp pressure still drops, then you are looking at an oil pump issue most likely.
I recently took my car in for this problem. The thermostat was replaced a year ago. This time they replaced the thermostat and the IAT (air intake temperature sensor). The thermostat was 20 and the IAT was 50, with labor it all came to $140. Most sites online that I found suggested replacing both the sensor and the thermostat at the same time. When the thermostat goes, it usually takes the sensor with it. So I'd have them replace your sensor too. Good luck.
strip and repair job here head off skim and rebuild ,then sort fan out new sensor and possibly a new fan ,is their two fans on this model or a two speed single one ,cant remember been a while since i done one.