Again everyone, thanks for the feedback. I was under a time crunch that day, needed to take the truck to get something, and was probably overly cautious by dumping the oil and filling with new. The oil that came out looked perfectly fine and it was definitely wasteful. But under my time-constraints I was unwilling to risk my engine if I was wrong. Small cost for peace of mind, but a good education for the future. Vehicles will get more highway time more regularly! Thanks!