Going to have to agree with Roscoe on this... Changed
oil yesterday for the first time and saw the cooler as a problem but figured out that the
oil I was dumping was good anyway..
When changing
oil on the boat I used to use a pump (siphon) that slipped down the dip stick hole and pulled all the oil out of the marine engines. Possilbly this could be snaked down into the hoses and pull the oil out??? They're about $30. or $40. at marine dealers... Might be an option and would be a lot easier and less messy than blowing it out...