I've got a new Ford Freestyle SEL with a 6cyl Duratec. It has 2,450 miles on the engine and would like to change oil and filter for the first time. My questions: Is it time to change at 2,450 miles? Or should I wait a bit longer? Is Pennzoil 5w20 an appropriate oil to use? Must I use the Motorcraft filter? Thanks for any help you can provide.