I'm currently located in central Texas and been trying to figure which oils are good for our vehicles (read signature) year round or if I should switch due to the seasons. Most of the topics just talk about using a particular oil year round due to their climate but I'm Texas it can be bipolar [censored]. Some winters it can get in the single digits (rarely) and easily triple digits in the summer. I'm currently deployed and plan on doing UOAs for our vehicles when I get back to get a better feel.