The e300td is a great car , it is old world German engineering with reliability with some new world toys.
It is not the cars of great such as the 70's and 80's diesels but it will run fine with just a few sensors going every so often.
It is pretty fast for it not being the newer style direct injection and is still not as quiet as them either but worth its weight. It is a hard car to come by cheap.
Now is it better than a 98-00 LS400 , not a chance but a 95-97 LS400 for sure it is hands down as that is slower and thirstier.