I've got a strange question about a 2000 Discovery with the 4 liter,
Is it common for a discovery with this motor, to seep oil and coolant from the head gasket without blowing the gasket

 

You can certainly have an external leak. Can it be solved by re-torque? Most likely not. If head gasket was replaced by previous owner, he may have done a quick fix and not had the heads machined back to spec. Are you sure it is coming from the head and not the valley pan gasket?

 

i dont know, this is what i was told by the dealer, i was wondering if it was a common thing for it to seep like a dodge neon.

 

No it is not common nor to be ignored. Coolant leaks usually get larger.