[Petah78]

The problem with air to oil cooler isn't just leaks, you also run into problems with overcooling/longer heat up periods of the oil. In some cases, pending on your geographic location and model of oil cooler, your oil might never get up to temp in the winter! OEMs install factory coolers/warmers for a reason. I rather run hotter oil for the odd track event (less than 1% of total usage) than oil that it too cold for the street (99% where my engine operates). I really think oil cooler is a very "YMMV" debate.