Thanks for the tips. I know it is leaking out because I can see it drip. And yes there is quite a lot of oil on the underside of the car, front to back. It leaks so much it comes underneath and catches the air and coats the back of the car so that if you open the trunk you get oil on the hands.
I looked underneath yesterday and couldn't pin point the source exactly but it was below the oil filter bracket and above the starter. Will look more when I have the time to move some things around.
'92 190E 2.3 200K
'03 Toyota ECHO