i have a 2016 frontier V6, king cab, 60,000 miles. auto trans not 4 X 4. iam running castrol 10-30 full syn. iam thinking of going to shell Rotella sae 12W-40 full syn. i live in Wichita, ks. the coldest the air temp in winter is 0. i am wanting to get more engine protection in hot weather. what think?