When I start my truck cold it runs very rough and smokes. Also will not make power. Once warmed up it seems to do fine. What type oil should I be using? I am in northern, IL.
THX

I would only use a full-synthetic diesel HDEO in a diesel truck, particularly in northern Illinois where it gets cold. There are several suggestions in the link below:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-8.html#post1415281