Thanks people for your feedback. I think I will play in the middle of the field of the recommendations by the dealer and the chrysler service guy and get the oil changed between 5,000-7,000 kms (not miles). I have the xfire on a work lease for 3 years and 15,000 kms a year so no the car will not see 100,000 kms under my ownership.

P.S. People we aren't all outback hicks here in australia like crocodile dundee. I live in Sydney a major world city of nearly 4 million people with the same road system as major American cities with little to zero dust, but yes it can get hot here in summer up to your 100F in the really boiling hot days in January.

Regards
Scott.