I just changed engine oil in my Yager and it IS 17mm. Socket works better than box end since in my tool set the socket is thinner wall than the box end. This is the drain plug on the SIDE not the strainer on the BOTTOM.
Karl
thanks for the post, Karl.
I probably didn't make it clear in my previous post that the 17mm is exactly what's needed for the oil screen bolt on the bottom. it's good to know that the 17mm also fits the drain plug on the side.