Hello there, was told the car was driven and parked in place and hadnt been started in two years or so but that it ran. Checked oil and it is black and a quart or so low. I have not started it because im going to go ahead and replace the gas tank and I have to buy the top and bottom radiator hose, heater hose and replace a line that ran from the back of the a/c compressor into the radiator before I try it. I was told by someone that after not running for awhile it is best to leave the old oil in it for first 100 miles because the new oil may break up the sludge inside and clog it up, is this true? Or should I go ahead and change oil and filter as well (like I would prefer to do). Also the power steering leaks after cranking the wheel every which way to push it into garage. So is there anything else I should check out or replace before starting?