Ok, hubby drives home yesterday from work with a trailer full of gravel. Shuts off the enigin, tries to start again with no luck. After trying to jump off, we have it towed to a shop. They change the starter and both batteries, still will not start. They are saying that it is showing NO oil pressure. They have not checked anything else and are saying that it could be something in the engin or a sensor. Does anyone on here have any idea? This is the first time that anything has happened like this.