I also have an '08 (XC70)
It makes the chattering noise as it sucks the key in when it is inserted - it makes this noise every time. After I shut the car off, I push the key, and it spits back out with the chattering noise.
Once in twenty times or so, it spits it right back out - with the chattering noise. I just push it in again.
We have not had any starting problems.
Our '12 does not make any noise, and the key snaps into place.
If you do have to repair the key slot, see if you can use a later mechanism, such as in the the '12. The keys look identical to me, and I have inserted the wrong key into both cars by accident with no apparent problems - except the car won't start!
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