Cummins 4939587 Genuine Engine Oil Pump

The Cummins 4939587 Genuine Engine Oil Pump is a direct-fit replacement for your Dodge Ram 5.9 diesel engine. The oil pump is one of the most important parts of your engine as it circulates oil throughout the oil passages in your engine. While the oil pump isn't necessarily a common failure item, it's a good idea to replace it when you've got your engine torn down for an overhaul or rebuild.