It's been a couple of years so I can't recall exactly where I found out about this, but even online car auction sites mention that one should beware for foreign money transfers, so there must be some truth to it and it must have happened before.
But maybe it was warning against something like the buyer sending a scan of some confirmation of sending the transfer, and tricking the seller into releasing the good just based on that confirmation of the wire, which of course can be forged. Anyway I never seen a car website warning against INCOMING wire transfer risk for the seller.
I tried to Google "wire transfer scam", and I found this:
http://www.webmasterworld.com/forum22/3377.htm which is a long discussion which concludes that its safe and there are no reversals.
About warnings for online car sellers I found this:
http://www.commerce.wa.gov.au/consumerprotection/scamnet/Scams/Online_car_sales_sca.htmlwhich is only about accepting Paypal, including the buyer sending more then the price of the item by Paypal, and requesting the seller to send back the rest by wire transfer - so then the buyer will reverse the Paypal, and the seller... won't be able to reverse the wire.
I'm reasonably confident that a wire which appeared in my bank account will not disappear from there and would accept such payment for Bitcoins from a stranger without fear, perhaps waiting three days to make sure the bank doesn't contact me about something strange if the transfer was especially large, like several thousand dollars.