I struggled with this question a bit as well. I eventually decided to wait for 10,000. My reasoning was primarily for break-in. I could not get a straight answer out of anyone if there actually is a difference between the original factory oil and retail. On some larger TDI VW will give you a 5,000mi change for free in addition to the 10,000 change. Now this is a different engine so I could not be certain if that would influence the decision. I will probably change it every 5000 after the original 10,000 change.