I am looking for suggestions. I want to do a one year oci on my mom's dodge caliber using a off the shelf oil. My options are 5w-20. Mobile 1 ep, Penn ultra, castrol edge, royal purple sn, or regular Mobil 1. The vehicle only sees 5-6000 miles per year with very little highway mileage so I think it needs a pretty stout oil. I thought amsoil would be overkill but now with all the short trips in mind it might fit the bill.