Hi Silver 50,
as HighWheels already has written, the N62 (V8) engines have no specific problems, which you have to be afraid of...
On my point of view, there´s only one weak point in this engine concept - the water pump.
As an symptom of old age or due to wrong mounting, it´s possible to get an axial force on the water pump bearings until it gets totally defective.
This could sound like a bad bearing or a bad belt drive guide roll.
Not necessary to say, that a bad water pump can cause a damaged engine.
But this is an peripherial problem and not directly one of the engine itself
Up to now I haven´t heard about other specific problems like leakage air problems on the older M60 (V8) or anything else.
IMHO it´s a very good engine concept - enough power combined with a bearable gasoline consumption.
Regards Peter