What is the problem with my car on 2003 Chevrolet Monte Carlo

My car is leaking oil to the tune of about 4 quarts in a 2 week span after driving it 100 miles a day 5 days a week, getting worse by the day. I just got the water pump replaced and the plastic nub above the water pump replaced(a leak that was horrible and drained my radiator fluid in about 5 minutes) that went bad 2 weeks ago. Could my mechanic have done something wrong? Also if the mechanic overfilled my oil which i had changed..... which he did 5 quarts when it was supposed to be 4.6 could my seals have gone bad? Most of the oil is as the rear of engine beneath the water pump and not from filter or drain plug. any ideas?

by in Mount Gilead, OH on August 16, 2012
3 answers
ANSWER by on August 17, 2012
seek diag and est as the car needs to be looked at to give correct info
ANSWER by on August 17, 2012
Oil can leak from a hundred different places and even internally. I would have it inspected professionally have a dye test done to determine all sources of leaks.
ANSWER by on August 19, 2012
Timing cover gasket disturbed/ Oil pressure switch damaged while replacing water pump?
Related Items:
I don't know whats wrong with my 02' Chevy Monte carlo. HELP!!! I was driving and all the lights on the dasd flashed and shut down. This caused my gas not to even work and making it difficult to tu...
Ok, I have replaced the water pump temp sensor radiator and thermostat. Flushed the system several times and now its ticking.what is going on??? The dash is below 0. It doesn't work. What is wrong ...
It started about three months ago and to drive down the road it's fine but in town it will overheat when ever I get cought at a light or behind slow traffic and I have taken the thermostat out. I t...