Does the moisture come from water in the fuel or is it introduced through the air intake/turbo? Again, new to deisels and not mechanically inclined. Do I need to do some preventative maintenance on the CAC prior to long hard trips? like maybe inspect the CAC for moisture already present or something else? Or is this something that I cant prevent regardless of what I do. I read somewhere here that the CAC needs changed out every so often? Where do I find the interval and procedures to do this?