It really shouldn't matter, the Setrab core flows in either direction. I guess when you do the oil change, it might be a good idea to have it aiming down so that everything drains more easily. There's gonna be some oil left in the system anyway. As far as actual operation, it shouldn't matter if they are facing up or down or diagonally, the motor has an oil pump so there's always positive pressure in the system and the core is always full of oil.
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