2006 Ford 6.0 Turbo diesel ???

Wow, where to start...yes, the engine had problems, but they've all been identified and can be addressed by aftermarket applications, if necessary. 8k is probably high, but could be up to 5k as a worse case scenario. Good thing is that they are available at good prices due to the reputation. Powerstroke.org has a huge amount of info. Easy thing to look for is whether it has a coolant filter and heavy duty coolant, which is typically red. If it does, previous owner may have addressed some issues already. Next step involves getting ahold of a monitor which will cost a few bucks, so if you're not willing to go there, the rest doesn't matter. It's a toweing beast if you're willing to do some research and learn how to recognize potential problems.