Cumins isx 15 NEED HELP AND ADVISE

[Kenworth t660]

I have the laptop and the adapter i am going to order. What can i say i dont have experience in the mechanical part of trucks . Also i llive in ca and i know a hand full of mechanics and 90 % are bs . So thats why im here for help . I want to change that and stop spending money on crooked mechanics .

Rawze..when i said i wanted new truck its cause the one i looked at kenworth t680 2020 came with 4 yr/500k factory warranty . Since i dont know much about truck engines why not go new and be fully covered ?