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1) Check the valvetronic system for issues, this can be common.
2) Rear brake shields on some earlier build cars have been recalled for crunching noises due to rocks, and the new models do not have this issue.
3) Make sure your diff oil was replaced properly like noted above, it is supposed to be MSP/A but that is not available in the USA it is only available in Europe and Canada, so if if you cannot get MSP/A get SAF-XJ.
4) Make sure your oil pan gasket is not leaking.
That's pretty much all of the issues I can think of right now.
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