I recently purchased a used 2008 Dodge Grand Caravan with the 3.3 liter V6. It was previously used in a rental fleet (Enterprise, I think). It has 38,000 miles on the odometer. Typical usage will be short trips back and forth to work (under 5 miles each way) with the occasional weekend trip of no more than 30-40 miles. I probably will not put more than 5,000 miles per year on it but plan to keep it at least 5 to 6 years when usage will increase. (I have newborn twin boys.) 5w-20 is Dodge's recommended weight. Is there a specific oil that works best for the type of driving this van will see? Cost is not a concern. Also, does anyone know what sort of maintenance schedule Enterprise Car Rental follows with their vehicles?