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Oil Temperature/Cooling

Engine

Vehicle Information: Year: 1990; Body Type: Targa; Engine (type, size, modifications): non turbo ,3.6L,stock; Total Mileage: 65,700;

I have owned the car for 2 years. Until recently the engine oil Temp guage rarely read as high as the 1/2 mark( 1/2 being the line slightly below center on the guage). Temp guage usually read between 1/4 and 1/2 in most conditions. What I am experiencing now is: from cold or warm the oil temp will climb to just above the 1/2 line then if I am on the highway or continuosly moving at reasonable speed it will go back down to about midway between the 1/4 mark and the 1/2 mark on the guage. If I am in traffic it will hover around the 1/2 mark. I have taken it to my mechanic, he spent several hours on it and changed the temp sending unit which did not fix the problem. Not sure what to do next.

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