The really big oil leak problem is there is only 1 common oil leak that I am aware of.
Similar to the I6 OFHG. If you have a V8 with an oil cooler it is much easier to correct then without the oil cooler. Still kind of a PITA, cheap gasket, but a PITA to sort out. There is a oil passage that is blocked/connected with the alternator bracket on the engines without oil coolers, but the engines with oil coolers you remove the oil cooler interface plate as I recall.
Vacuum pump can also leak oil, this is not so bad to repair.
Coolant leak from the center coolant pipe can be a problem, but I installed once of these as PM in my N62 when I replaced the water pump.
Bimmer Fix | Coolant Pipe Repair System
Yes, replace the water pump by 70k miles, the bearings got noisy in mine before I took a 2200 mile road trip, but the pump survived and was really noisy when I returned.
I am also running a cooler HamburgTech thermostat in my 4.8l.