does anyone know which way the oil travels at the exchanger? i'm trying to establish which port on my adapter would be best to designate as "to cooler " and "from cooler" . can't find drawings on the subject. and if one port goes to the top end it would be nice to know so placement of a thermostat would be correct. if it'ss just a loop through the exchanger then to the pan i'm not concerned but if to top end ....well you see my point.