I just got it and it runs great and sounds fine at 115k miles, but no service records. My mechanic says I have a single timing chain, but he doesn't see any reason to check it from the performance and sound aspects. It will take $400 to just remove the cover to check it out. Am I being paranoid? Should I pay $$$$$$ to swap in the double timing chain? I heard it was a 40 hr job. Heard it used to be a free swap at the MB dealers, but no longer. What's the truth and what's hyperbole?
Chip