2003 Audi Quattro oil light on and it is overheating.

Oil light came on and I put a quart in
it. Light out.  Today it overheated
while driving on the highway warm 86
degree weather.  Stopped for traffic
and steam came out and antifreeze
poured out to the ground.  Would only
take less than 1 gallon of coolant.  
Driving home the oil light started
flashes and I stopped for traffic and
she died and I had to be pushed
home.  Ideas? My email is
lashade49@gmail.com.  thanks