Have a decent leak emanating from around the oil cooler where the oil filter is mounted. I checked the oil filter and also replaced it and made sure it was tight but the leak persists. I can't seem to find much on the internet about this issue or any help on replacing the oil cooler. I did see one video showing an aftermarket Mishimoto oil cooler conversion being installed, and it showed the oil cooler being removed with a 12mm allen socket wrench. Is there really only one bolt holding this oil cooler to the block? Also, it looks like this "bolt" actually has a port that oil flows between the block and the cooler. Is there any gaskets or o-rings that are needed if I determine I need to replace this cooler? Thanks for any assistance.