After the first oil change...

[Chupacabra]

Changing the oil is the single most important thing that one can do to maintain and extend the life of their vehicle. On a new car....I recommend changing the oil at between 500-1000 miles. After that....I would change the oil every 3K miles or 5mo., whichever comes first regardless of synthetic oil or dino. This is my own style and I don't agree or disagree necessarily with any other regimen BUT do practice my own interval outlined above.