88's and S-88 generally go between 7,000 and 8,000 engine hours between overhauls. The first motor on Pop's 88 made 7700 hours, the second made it over 8,000. The current motor has in the neighborhood of 5,000 hours on it. Our S-88 made it to just about 8,000 the first time around. Both of these tractors ran two row forage havesters the first 4-5 years of their life. They got used hard. I'm talking engine hours, not clock hours, now. There's a big difference.
The 310's are pretty good until you get to the turbocharged models. There's a reason you see a lot of Cummins powered 1855's and 1955's. There's a reason White returned to the 354 Perkins in the 2-105's.