Replaced radeator and thermostat in 95 BMW 740 il and still leaking coolant looks like from oil pan

It's probably the water pump. Without seeing it nobody can tell you for sure.

Is it leaking from the front of the engine or the rear?

You can purchase a leak detection dye and kit. Pour the dye in the radiator and run the engine for about 10 minutes. Then take the black light out of the kit and run it over the engine to locate the leak.

A good idea. But the water pump has two pipes that underneath the intake manifold to the rear of the block I need to find out exactly where it is leaking.