Problems. Poll: Keep or sell?

[biomimetic]

It was a 1 owner car trade in - I am the second owner. With a carfax of 84/81. It appears the X5 was traded in when the waterpump failed and was replaced at that time. It did not show up on a list I requested of work performed on the vehicle - but it was the carfax listing not the internal BMW dealer listing of work however. Which makes it hard to explain why the car has the wrong anitfreeze in it - red not BMW blue - the dealer deciding to save all of $12. on fluids to make sure I knew they did a crappy job. Or why there is antifreeze residue all over the inside of the engine bay. Which leaves it as done under the dealer's time with the title - it is not possible that give how warped the valve cover was that the car had performed for any length of time before trade-in (unfortunately, this is my opinion, not something empirical). I am trying to get ahold of INPA software which should have time/date stamps and have logged the overheating which should finger whoever is responsible on the timeline. More irritatingly, as I said, the head is not warped: it is damaged at the bolt flange beyond normal helicoil type repair. Probably a bolt pulled out when the valve cover warped - plastic garbage. The Z4 had an actual metal valve cover at least. I am a little afraid I am going to find helicoils in the lower engine when I remove the head and that at least one of the heads had to be replaced. I'm in the process of filing legal complaints, yes, and will be posting this over on bimmerforums and BMW CCA as well.