Check out post #2 here about the window motor I was just answering a similar question yesterday and the same applies to your situation
The engine was specced out to use Nissan conventional 5W-30 conventional motor oil, if your engine doesn't consume any oil feel free to experiment with synthetics but I would STRONGLY recommend you always check your oil weekly on a cold engine before it started. The VQ is fairly notorious for consuming oil, if you are consuming oil then I recommend you stick to conventional, many folks have lost their motor because of not checking the level regularly and running the motor nearly dry.
The most common point of oil leakage is the valve covers, either from the individual spark plug well seals (remove coil packs and visually inspect the spark plug well to ensure it's free of oil) or the main gasket around the perimeter of the valve cover, use an inspection mirror and a flashlight to look around the edges of the valve cover.
Have your rear differential bushing inspected for wear, it's a common point of failure and can lead to destruction of the rear differential if it gets very bad and is driven hard.
What was the reason for the salvaged title and do you have any pics of the car? Welcome aboard!