Don't be a spoil sport. The 250s and 400 series Belarus are very good tractors. The reason you see so many sitting idle and farmers that rely on a tractor for their living won't have one is that the support network STINKS!
Belarus USA in Milwaukee knows little or refuses to share any information about immanence or repair of these tractors. They would do well to provide manuals on line and source better quality consumables for the owners.
From a reliability stand point, good maintenance makes for a good life. These little air cooled diesels have been scavenged for used in the oil fields, running 24/7 for years on end.
The bottom line is that if you are reasonably competent mechanically and willing to be proactive in your maintenance your Belarus will last a lifetime.