Not a Jeep shop, I wish I knew of one close or semi-close to me. I was just concerned about proper maintenance. I'll see if the manual says something or call the dealer to get the standard replacing mileage if any.Is it a jeep shop or just a run of the mill shop.. Call the dealer and ask them. Mine has 136k on same timing chain it came with. Is the jeep hard to start, missing etc... why do you think it needs replaced?