I am a US citizen with a (class B-P2 commercial) drivers license. I also have a valid IDP card to go with it, which I understand is not strictly required in Turkey but always nice to have when abroad anyway. It is my understanding that it is valid to drive in Turkey on a US license. In fact I have had multiple rental car agencies validate this and have had my license checked by the local police on several occasions and no problems came up.
However I have heard from several unverified sources now that this allowance is only true for visitors, not for residents. I have heard this variously defined as having a residence permit instead of a tourist visa, as having been in the country more than 90 days, or as having your last date of entry be more that 6 months old.
I cannot find a source on how this actually works or if this suggestion is bogus. As a long term resident with a residents permit (ikamet tezkesi) am I required to apply for a Turkish driver's license in order to continue driving long term?