hi im new to these forum and new to diesel. Im very interesting in a diesel benz. I look forward to making my own biodiesel. here are some questions i have

1. Turbos ever go bad?
2. It seems 80-85 are the good years?
3. what are some good price ranges...i would not like to spend more then 2500
4. what are some things i should lookout for


thanks for looking