Oil Cooler Leak

[His Dudeness]

Is it leaking at the bottom of that thin metal pipe? Try undoing the bolt and check if there is a crush washer either side of the metal line. So there should be one between the engine and the metal line and then one between the metal line and the head of the bolt. Hope that makes sense. Also if it is leaking around those washers you could try just getting two new copper washers and that might solve the problem.