My boyfriend had a transmission line pop off radiator after replacing radiator days prior...ran to O'Reilly's where they looked up the car and gave him Dex III...He brought it home where I went ahead and poured it in...no fluid out drain plug...I need more right? So I do my research-------dex VI was called for! Dex III not compatible w dex VI ENGINE but dex VI can go in dex III??!!! What do I do now??!??