3000lbs on a DC10 are absolutely nothing.
I started my career in central Africa and if I told you by how much the MTOW is regularly (INTENTIONALLY, OF COURSE) exceeded that would scare you!
Actually nothing happens, just slightly flatter gradients...
And overweight landings are even more commons.
Anyways, in the modern world too we regularly exceed the MTOW: do you really think the average pax+handbags weigh76Kg on a charter flight?
HAHAHAHAHAHAHAHAHA!!!!!!!!!!!!!