Hey guys. I've read post after post on what the correct oil to use is. There is concrete evidence that 5W30 should be used, but also evidence that 10W30 should be used. I work at a dealership and can verify that we got a dealer mail stating to stock up on 5W30 for the SRT-4, but then a few months back we had a Master Tech test/booklet that stated to use the 10W30. I myself have bought 5W30 Mobil 1. Most new cars out there suggest 5W30 from the start, so who knows? I'll contact Chrysler tomorrow and find out the 100% suggested oil to be used and update you guys ASAP! ANy other questions you have while I'm on the phone with them?