My wife drives a '10 XC60 T6 AWD. We just came to 105k miles, and it's due for a service. The dealership had mentioned during the last service that the timing belt would need to be changed at the next service. However, I'm reading that the T6 has a timing chain, not belt. From what I understand, these are not wear items like the belts are and only need replacement if they are making noise. Is this true? Also, what services should be performed at the 105k service? I don't necessarily trust the dealership now.