Really? I know this. Ok. I'll try again. Lets except cooler and problem with it. Oil goes from tube to CSD IN temp = 110(for example), CSD works and heats up (because gears and shafts rotate etc) OUT temp = 120 (for example) RISE = 10. Then IN Oil heated up to 130, what will happen with OUT temp and RISE respectively? Moreover, as I can judge this is closed cycle!