Just joined the site. I just got an '06 F350 SD PSD Exteneded Cab 4x4 w/140K miles. Slowly familiarizing myself with the 6.0L and its strengths and weaknesses and what it needs to be reliable and well looked after. I don't think the previous owner was much of motor head, but the engine did get an $8K rebuild about 25K miles ago. I just did an oil & filter change and used Archoil AR9100 to help with a little stiction issue and I'm looking to get a Dashboss system installed as the next step, followed most likely by a blue spring mod and a coolant filter. Love my Super Duty so far ...