So, I'm looking into changing the oil in the mustang. I've had the car for about a month and a half and I feel it's time. Doing research, I seem to be finding that most Gt owners are using full syn. I have no idea what the previous owner put in this car, all I know is i want to do it right. Now, I'm working on a budget, so what are your opinions? I was looking around and thiking of the Ford Motorcraft full syn or syn blend with a FMC oil filter. Also if its running dino oil right now, should I leave that in it?