Don,
look at the pic in this thread (
Nekkid OM617)
The oil filter is in the same place on your 616...bottom left front facing forward. Warning, it doesn't use the same cartridge as the later 616 (with the top-mounted oil filter) and you WILL make a mess changing oil.
Also, you'll probably need a 17mm hex head wrench to get the drain plug out of the pan.