You will more likely have to purchase local car insurance at the border when entering Turkey , they will do a minimum 6 month Policy I believe.
On the 180 day not having been in the country prior, I have had conflicting reports , some had issues some did not and how rigorously they enforce it.
I am driving back next month with my son in law ! He is Turkish , but the car is registered in his name, they have had issues with there UK insurance company , where when ever you mention crossing into Turkey then your insurance is immediately void. Be interesting to see if anyone else has had the same issues or might know of any different ways around it,.