I PURCHASED A 2003 DODGE 2500 WITH THE SO CUMMINS' DIESEL ENGINE. I NOTICED THE STRONG SMELL OF DIESEL FUMES WHEN IDLING WITH THE FAN AND/OR AIR CONDITIONER ON. I HAVE ONLY HAD THE TRUCK ABOUT FORTY DAYS. I ASSUMED THE SMELL WAS BECAUSE THE ENGINE WAS NEW. I NOTICED SMALL PLUMES OF OILY RESIDUE FORMING ON THE WINDSHIELD ABOVE THE AIR VENTS. I HAD THE TRUCK DETAILED AND THE INSIDE WINDSHIELD POLISHED. THE PLUMES APPEARED AGAIN AFTER SEVERAL DAYS. THEY ARE NOT WATER VAPOR BECAUSE THEY REMAIN ON THE WINDSHIELD AFTER THE TRUCK HAS BEEN PARKED FOR HOURS. I CAN ONLY ASSUME THAT MY WIFE AND I HAVE BEEN INHALING RAW DIESEL FUMES FOR OVER A MONTH. THE TRUCK IS CURRENTLY AT THE DEALER'S SHOP IN AN ATTEMPT TO FIX THIS. HE HAS NO IDEA WHERE THE FUMES ARE COMING FROM. I DON'T THINK I WANT TO KEEP A NEW VEHICLE WHERE THE VENTILATION DUCTING IS SATURATED WITH DIESEL RESIDUE. IT HAS 1,955 MILES ON IT.