I am not sure where, but the car is losing oil at a fast rate. Changed oil 2 weeks ago and the oil light is coming on and th oil is low already. This has been ongoing for about 1.5 years. There are 160K miles on it and my wife has taken it in for regular oil changes at the dealership since she got it. I changes the valve cover gasket last year. I did the last oil change myself 2 weeks ago and noticed that there is a lot of oil sludge on and around the oil pump. any idea where to look for the leak?