Originally Posted by MattP725

I think OP was meaning so you could drain the cooler when you change the oil (without removing it).

I was actually thinking this but there is a major problem... the cooler has rows, it isn't like a pan where all the oil gravitates to the bottom of hte unit. The only way to have a drain on an oil cooler would be to have some sort of removable seal on the bottom row which would be a big liability for a company to design and nearly impossible for a basic user to fabricate.

The possibility of leaking would be way too great and then you have a much bigger problem.