i am a w123 diesel guy myself. but i have a lot of w124's. none diesel though. but from my time on the forum i have not heard anything deadly about the w124 diesels. glow plugs are a pain, but i do not remember anything else. as for odd cylinders. forget whatever you are thinking. my old 5 cylinders are smoother than any v-8 i have had. and turbo is a GO.