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So it starts sometimes, but sometimes it will not? Have you checked the wiring at your ignition switch? Your lack of a key buzzer seems to me to be an indication that maybe one of the circuits in your switch is failing. The circuit for the starter goes straight through to the starter, but the other circuits must also be powered up to activate the ECM and other systems.
no, the oil light will always come on if you are cranking and it doesn't start, due to the engine being at a certain RPM but the pressure not being where it needs to be (because it is not running) It won't keep it from starting.
This is a diesel, non-turbo correct?
OK, that makes it a little easier for you to do some testing when it fails. I would start out by seeing if you are even getting a spark from the coil when cranking, and also pull the fuel line end off and put it into a glass jar, make sure you are getting fuel flow from the pump.
As for the battery- it could be something as simple as them not driving it enough, so the battery would sit half-dead and go bad. If you experience that it goes dead just overnight, then you have a draw and can trace it down. Or can check your charging system to make sure it is charging at an OK level