When it comes to maintaining or upgrading your 2004 Workhorse Custom Chassis R20, choosing high-quality parts is crucial for ensuring your vehicle stays in top shape, whether you’re tackling a repair or enhancing performance. At Advance Auto Parts, we know how important it is to find the right Oil Pump for your R20. We currently carry a top Oil Pump in stock that is built to last. Whether you’re replacing a damaged Oil Pump or looking to upgrade, our selection for the 2004 Workhorse Custom Chassis R20 ensures you’ll find exactly what you need to keep your vehicle looking and performing its best.