According to its website, Tehran Diesel Co. LTD has been importing and distributing DEUTZ engines and related parts for almost half a century in Iran. (Tehran Diesel Co.)
(http://tehrandiesel.com/en/about-us.html)
DEUTZ lists Diesel Motor A.F.Z. in Tehran as its distributor in the country. (DEUTZ Website, “Distributors”) (http://www.deutz.com/file/8a85818a2370a3fd012433ddfff71b9d.en.0/deutz_netz.pdf)
According to its website, Deutz has a branch office in Tehran. (Deutz Website, "Partner List") (http://www.deutz.de/file/8a85818a2370a3fd012433ddfff71b9d.en.0/list_of_partner_3_2012.pdf;jsessionid=0EF56386E1D42C3C27B735BEE5E9AC72)
Deutz is listed as a participating company at the 14th International Exhibition of Transportation & Urban Services & Related Industries which takes place October 27-30th, 2016 in Tehran Iran. (Participating International Companies) (http://www.avin-co.ir/Facts---Figures/About-Shows/%D9%86%D9%85%D8%A7%DB%8C%D8%B4%DA%AF%D8%A7%D9%87-%D8%A8%DB%8C%D9%86-%D8%A7%D9%84%D9%85%D9%84%D9%84%DB%8C-%D8%AD%D9%85%D9%84-%D9%88-%D9%86%D9%82%D9%84-%D8%B9%D9%85%D9%88%D9%85%DB%8C-%D9%88-%D8%AE%D8%AF%D9%85%D8%A7%D8%AA-%D8%B4%D9%87%D8%B1%DB%8C.aspx?lang=en-US)