check the car from start up, any smoke can indicate worn valve stem seals, or even worse a worn turbo, take it for a spin and watch for smoke on overrun this can indicate a worn turbo, it will be a oily blue smoke, check there isnt any knocking from the bottom end, a rattle in head isnt as bad as the cvh is easy to work on, at around 50k the standard cam is coming to the end of its life and normally changed at 60k so bear that in mind.