I would like to say to anyone in here reading this, BE VERY VERY CAREFUL when jacking the car from the rear point. In my opinion it should never be done. There will be people here that argue that the mileage and age of my car was more a contributing factor than the jackpoint itself but I'm not so convinced. I've got a 1999 996 with 97k on the clock. I was raising the car on all four points to do a transmission oil change and engine oil change all in one shot. I jacked the two rear points to put stands under the front jack points. Then started to raise the rear using the motor point in the back. Up and up she went when all of a sudden BAM!!! the left motor mount let go and fluid started gushing out all over the place. It let go so violently that the jack shift a bit and slipped off the jack point (if that is what we are calling it). Closer inspection showed that the jack settled on the cast aluminum coolant "tank?" right behind it. Punctured it and caused a pinhole leak of coolant out. That "tank" is fully integrated into the back of the engine and the car. To remove it and have it welded would be a serious endeavor. So I got some high temperature, metal infused, JB Weld Putty and plugged it that way. We'll see if it holds.
The cliff notes to this story is this: If your car is over 75k miles and you jack your car from the rear motor mount. Expect to be replacing at least one of your motor mounts the next day. It's a gamble I will never take again.