Whatever oil you use it must be to the vw 507 spec its a long life low ash oil esp made for cars with a dpf if it does not have 507 on the container do not use it no matter what the supercheap ect salesdude tells you
The low ash is vitially important for your dpf as a inferior oil will clog your dpf with ash way to quickly also it must be a 5w-30 (i think they might all be that but does not hurt to check) as with the extra fuel that gets dumped in a dpf burn some ends up in your sump and a lower weight oil ie 0w-30 ect will not protect your engine as well as the 5w-30 when oil dilution by fuel happens
As for 15k service length thats fine unless your car is doing heavy duty work like lots of offroad/towing/or is tuned for more power in that case i would do a oil and filter at halfway i.e 7.5k otherwise it will be fine the oil is made to last that long (it goes 20k+ in commercial vehicles)
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