You should always consult your owner's manual. It will clearly state the recommended oil viscosity (like 5W-30, 10W-30, etc.) for your vehicle. Using the wrong viscosity can damage your engine.
While 10W-30 is a common oil weight, some Dodge Caravans might specify a different weight for optimal performance and engine protection. Using a weight outside the recommended range could lead to poor fuel economy, increased wear, or even engine damage.