The recommended oil type for a 2005 Dodge Grand Caravan depends on the engine it has. There were several engine options available that year. To know for sure, you need to
check your owner's manual. It will specify the exact type and weight of oil recommended by the manufacturer.
However, generally, 2005 Dodge Grand Caravans used either 5W-20 or 5W-30 motor oil. Again, consult your owner's manual to confirm the correct oil type and weight for YOUR specific vehicle. Using the incorrect oil can damage your engine.