I respectfully don't totally agree with Mr. Carter. Yes everything has to be right on a diesel for easy starting in the winter, but that's true on any car. The main thing is that the engine be in good shape with GOOD compression. As long as you have good compression, any other problem that leads to hard starting is relatively easily fixed. The '83 has pin type glow plugs which do a great job. 9 times out of 10 when you hit hard starting you replace ALL FIVE glow plugs and you're back in business. As for diesel fuel winter gelling, there are dozens of inexpensive additives that you can buy at the truck stop to prevent subzero gelling.
Bottom line, before buying one of these cars HAVE THE COMPRESSION CHECKED. If the compression is good, just keep changing the oil to keep it that way and enjoy.