These vehicles require a particular the of oil, specifically VW approved 507.00. This is important because the motor oil that is supposed to be used in your specific diesel motor is formulated not to damage or foul you DPF or exhaust particulate filters.
I personally use Castrol Castrol EDGE Pro LL03, which I order from IDParts, because it's not usually available at a local Pepboys/Autozone etc, but is what most dealers use as stock fluid. Mobil 1 ESP can be found at these autparts store more easily if you're in a pinch.
If you are careless about what type of oil you could end up creating a problem for yourself that VW may not honor under their warranty with these cars because you used the wrong type of oil. Do yourself a favor and don't give VW an opportunity to deny any warranty claim you may have because they claim you used "inferior" or "non-approved" fluids.
Other than that, keep track of your milage by getting as close to empty as you feel comfortable and then refill. Record the amount of fuel put in and then keep track of your mileage. When you refill again, dive the number of miles drive by the number of gallons of your previous fill up. This will be slightly more accurate than the MFD/computer the JSW uses, and a great way to set the bar going forward.