All I'm going to say is working at a dealership myself, I have a dealer mail that was sent out stating EXACTLY that 5W-30 is to be used in the SRT-4. I'm not arguing anything because I was going to contact Dodge today but had a busy time and didn't get a chance to. It may be different per region, but I'm still trying to get a hold of Dodge to determine the EXACT answer.
(Not trying to be a smart ass either)