Originally Posted by 83w126

The W140 diesels are usually really expensive and the engines are known for having issues. The w126 is better as long as its not the 3.5 liter one, but they are getting old and parts are disappearing. The 1998-99 W210 E300 Turbodiesel is not bad if you can find a completely non-rusty one. They are easier to find parts for, and are generally up to being used for anything a brand new car could do.