The 2005 Grand Caravan 3.8L owners manual specifies 5W-20 (specifically that viscosity) with both MS-6395 and API Certification. It is the MS-6395 rating that is hard to find for the 5W-20 but it does occasionally show up for heavier viscosity oils. I really want to use Mobil 1 synthetic but they do not have a 5W-20. Mobil's 0W-20 does pass the Ford and Honda specs but no mention of the Chrysler MS-6395. I have found a number of brands that call out the Chrysler MS-6395 but only for 5W-30 or 10W-30. Amsoil 5W-20 is one example where the Chrysler spec is only called out for the higher viscosity oils, but suspiciously absent for the 5W-20. What does the MS-6395 spec require and is there a 5W-20 synthetic that meets it?