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Is the pipe metal or rubber? Rubber is a good insulator, which would give you a false low.
I would expect the temperature to be closer to what the engine operating temperature is, because the engine is heating up the coolant.
135 sounds kind of low. I'm not sure what the norm is though; the AW4 transmission that my Jeep has is known for running hot.
Edit: I misread what you said. I did not know it is an oil cooler. 135 seems low still.
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