I need a best guess here. About 3 weeks ago I paid a part time mechanic to change the intake manifold gaskets on my 98 suburban.Also replaced the timing cover and oil pan gasket. I just noticed a decent oil leak-maybe 3/4 quart in 200 miles. It looks like it is coming from where the timing cover meets the oil pan. How likely is this to be the case? Why would it leak-with a new gasket-in other words what did he do wrong-so I don't rtepeat it.He was in a hurry toward the end- he was a fast-too fast worker? Kinked gasket? Didn't clean surfaces well enough? Torqued screws too tightly? Is it more likely to be the oil pan gasket- or-I hope not-the timing cover-which is a new GM cover. The screws and two nuts don't seem loose- tightened tham slightly- no help. Thanks Charlie PS It was an autozone FEL PRO OIL PAN GASKET. PPS- It will be 100 degrees today!!