Now we have to connect our line to our external oil pump. From the oil pump we want to go to the oil cooler and then to the filter. That is extremely important, if we were to run from the pump, to the filter, to the oil cooler and then to the engine we could have disastrous results. With it set up that way, any piece of aluminum or debris that comes out of the oil cooler will not have a filter to stop it from getting to the engine. The correct way to run the oil lines is to make sure the filter is the last thing the oil goes through before entering the engine.