We used torque and angle to measure the clamp load... If we tried other oils, they would most likely fail in the multiple for angle...
We set a torque spec that we start measuring angle at, let's say 40 ft * lbs, so at 40 ft *lb the angle is now "set" to zero and we measure from there.. We would typically see angle run in the range of about 50° - 90° and we set a range that angle would be for the final torque... With "foreign oil" the angle readings would be higher and outside our angle range that was programmed in the machine...