to change oil or not????

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You can put the jack stands on the lower control arms and keep the suspension compressed while the tires are off the ground. Flat spotting was the worst part of the 993 resurrection I did. The car was being used infrequently, the owner would start it from time to time then it wouldn't start any more so it sat for five years gathering dust. The fuel was gelled, I replaced the fuel pump as it was the reason the car would not start. I drained the bad gas and cleaned out the fuel system and got it running. It took quite a while for the tires to round out. Also it smoked like a banshee until the oil from the heat exchangers burned out of the exhaust (a common thing with air cooled 911s that have been sitting). Flat spotting is a concern IMO for an over winter storage. There is a product called raceramps that prevents flat spotting without jacking the car but they are $180 a set.