the 220 figure is the minimum cold for reliable starting.

The cylinders and rings could be shot or The rings might well be stuck. Either of These would not happen overnight and not normally at such low mileage. I would suspect the following:
1. Lack of oil changes in the normal mileage and or run low on oil. (worn engine)
2. Lack of air filter changes. Diesels are very susceptable to ring and cylinder wear from dirty air. (worn engine)
3. Stuck rings from #1 or from use of improper lubricants or from running wvo.

If it is stuck rings it may respond to lucas oil synthetic (stp like) stuff or perhaps a switch to synthetic diesel rated oil.

If you are not running a proper diesel rated oil just a switch to a good diesel rated oil such as rotella might do it.

If its a severely worn engine the only solution is an overhaul. The only way to determine with no doubt is to tear it down and measure.

If you tell us completely and accurately how you have been changing the oil and what you have been running and your air filter habits we can help you evaluate your situation.

Good luck.

Tom W

__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.