There are Detroit Diesels and there are Detroit Diesels and there are Detroit Diesels and there are Detroit Diesels
BBP (Back Before Penskie) they were under powered, and they leaked and they guzzled diesel fuel
During the Allison era, some of these issues were addressed
During the Penske era, even more of these were addressed and if you can get one from the correct Penskie model year you will find what that year's Detroit Diesels were best at..... Passing filling stations (My brother is very happy with his, and he even loves the high cost of fuel, yes he does, you see, the company he's contracted with charges a "Fuel Surcharge" and while other drivers wine and cry because it does not cover the high cost of fuel, Not-So-Little (6' 6 1/2") brother actually makes a PROFIT on the surcharge)
Well, I think it's Damler-Chrysler's era now over at DD (Or was last time I passed the plant) and their software folks are not as good as Penskie's when it comes to passing filling stations.
Page 2: emmissions... Generally the more filling stations you pass between re-fills, the cleaner your engine is running cause it's burning more of the stuff... Not an "etched in stone" rule, (Perhaps cast in Jello) but generally
So, with DDs The age of the beast is very, very important, and no, I'm sorry, I don't know which ones are best/worst... That's my brother's department. I drive a gas buggy