I have a 2010 Titan with 80,000 miles and I want to switch from pyb 5w30 to a good synthetic. I was looking at castrol 0w-40. I live in cold a.. Upstate NY and want good start up flow. Mostly highway driving but occasionally get stuck in the city traffic. I drive that 5.6 very spirited. I've seen on here that 0w-40 performs very well in these engines. Suggestions please