I have a 1991 300D, and like all diesels they will essentially run forever, IF ALL THE MAINTENANCE IS DONE. If you want to talk diesels, e-mail me at asrosen1@excite.com and I will e-mail you my phone number. Before I purchased this diesel, I had never owned one, much less a Mercedes. I found all the information I needed on this website. I found the "search function" to be quite useful. Good luck.