Why do dealers not fix the oil leak from the passenger side of the motor? on 2011 Buick Lucerne

they do not know how to fix this ongoing problem since 2009. I have had the car at the dealer 3 times and still leaking oil. I am requesting a new replacement for my car. I only had about 5,000 miles when it 1st started leadking oil. I have had nothing but trouble with this car. With oil leak, tires and etc. I love the car, though. It drives good and smooth. Help

Asked by for the 2011 Buick Lucerne