What is the 2003 chevy silverado 2500hd oil type?

The 2003 Chevy Silverado 2500hd oil type iS5w-30. Having high quality oil is key for the engine to run smoothly. You will run into issues with the oil at some point. Knocking noise may show up from the engine. Bad oil can cause the engine to stop working. A common problem is an awful burning smell. This needs to be inspected as soon as possible or the car might explode. You could experience bad gas mileage. Your oil needs to be replaced eventually. Every 5,000 to 10,000 miles is a good rule of thumb. If You don't replace it, there will be issues with the engine.