Hello, and thank you for allowing me the opportunity to help you. If I am not online when you are, please allow me time to return. How long ago was the oil change done? Is it leaking while running or just when the vehicle sits?
Okay. If this is only occurring when under a heavy load then you need to start by checking the oil filter mounting surface. It is possible that the oil is coming out through there. If that seems fine then you need to take a close look at the oil cooler as that is also a common spot for this leak. Is the engine running fine other than this?