I have a '79 TransAm with a built 400 Pontiac. The car has been in my garage for 2.5 years while I did some work on it (non-engine related). I changed the oil with Mobil 1 10W30 before I parked it, with it only being fired up to move the car a few times since. The engine has a deep sump pan, so it holds 8 quarts of Mobil 1 ($$$). Should I change the oil after the car is ready for the road again? I hate to dump $40 worth of oil that was hardly used, but it is a couple of years old. By the way, I will not being using Mobil 1 in this car again...the car is a toy that only gets driven ~1000 miles a year when it's on the road, and besides Mobil 1 doesn't have enough ZDDP for my flat tappet cam. I plan to use Delo 15W40 from now on.