New old truck.
 

Hey guys just purchased a 1996 3500 with a 5 speed.....It has 196thousand an just wondering if you might know how long these engines last an when should i look at a rebuild? Plus is there some things i should do to make the engine last a little longer. Thanks guys.

It really depends on how it is taken care of and how hard it has been ran. The one I drive every day just turned over 300k and the motor is still solid. Do the regular maintenance to it keep the oil changed, fuel filters, air filters and all the normal crap. Make sure not to run it with bad parts like injectors, pumps, or harmonic balancers and stuff like that. And when things like the injectors or pumps fail don't cheap out and buy discount parts they don't seam to like cheap parts.

replace injectors every 100k miles