was lifting up my Z and the asphalt sank enough to cause the jack to slip. Hadn't even lifted it up high enough to get the jack stands under it. Outcome was a dented oil pan that had to be replaced. Could have been me under there. I had just recently moved into a house that is from the 50s so its definitely an old property this was my first time lifting a car on this driveway and now i know it's not that stable...