It's also worth noting that the LCI (2011+) 35d had the N57 motor, as opposed to the M57 in pre-LCI cars.

The N57 is more prone to timing chain issues and the chain sits at the back of the motor which makes it an expensive task.

Having said that, you'll find a lot of N57 owners that have never had an issue, it's just not as bulletproof as the M57.