Today I was changing the oil in my 94 mustang GT. Has the 5.0L engine. As I lay there on the creeper waiting for the oil to finish draining, I noticed a curious... gas? vapor? coming off of the oil itself. I also saw it coming out of the hole. It was just a small, smokey looking vapor that you kinda had to pay attention to see. I was just wondering if anyone else has seen this, and if so what it was.