I have owned my own nine G8 GT for over a year but don't drive it much and it is in the garage all winter. It was a GM certified car but was about to go ahead and service it myself. My oil life was still at 40% and drove less than 6000 miles. Noticed the oil pan gasket was leaking. Called and talk to a dealer and it was pretty pricey to replace. So I called GM they set me up an appointment with the dealer near me. They verified the issue and talked with GM and cut me a fair deal to replace the gasket. I pick the car up and the ticket red 8.8 quarts of oil so I didn't think about checking it at the time. About 150 miles later I stopped to fuel up checked the oil and it was about a half inch below the slashes. I had an appointment to keep so I called the dealer from the station and they said to get the oil up into the slashed area and made me an appointment. They told me it was not at a critical point but I was very unhappy to put it lightly. I added 1 quart at the station and that brought it up above the first hole.I had looked under the car couldn't see anything wet and there was no oil in my garage. Got home that day left it in the garage till I got into dealer couple days later. I took it in and they invited me out to the garage to inspect the under side of the car no leaks were obvious. They checked the oil while I was there man and added the half court twice to get it in the middle. They apologized and said it should be okay. I do not have the gauge package in my car. Luckily I should've had about 7 quarts still in the motor. I don't drive the car easy and it makes me wonder if I indeed was okay? I could kick myself for not checking it before left the dealer. I usually service my own vehicles because of this kind of crap. Anybody got any input? I would think with 7 quarts or better in the car and no lights coming on I should've been okay and the weather was cool. The car just turned 17,000 miles.