Hi all , New to the site and looking for advice . My 2006 X trail 2.2 diesel has 28.5 k miles on clock and fully serviced . Last service was 2.5k miles back . On starting in the morning from cold , there is a lot of " Clatter " from the area of the timing chest . It sounds like someone tapping with a hammer and is irratic but very noisey . As the engine warms , the noise lessens and eventually disappears , and settles down to a steady tickover . I first began to notice this condition before Christmas and It has been very pronouced during the cold weather , but this morning the gauge showed outside temperature of 5 degrees , and the startup was still noisey , but less so than the colder mornings . The noise dissapeared much quicker , which suggests temperature is part of the problem . At the last service ( not by Nissan ) the garage used fully synthetic oil . I do not know what was in before , but the two previous services were done by Nissan Dealers , so i assume they used something similar. . Once up to temperature the car runs perfectly and is reasonably quiet . I see from topics on this forum , the concensus seems to be that the Diesel engine is considered a noise one . I also noted that there was an issue with camchain tentioners on the earlier engines ? . Any help/advice appreciated .