Solid oil exchange interval 15,000km with 2.4D useful?

I have bought the Volvo V70 MJ 2009 only half a year ago and so far very satisfied with the Ocean Race. This one has the 2.4D with 2400cc and 120kw in it. Only 2 things are not quite satisfactory: The ZV closes the rear left or does not open, probably the magnetic coil is too weak, the pin twitches always something, however, does not jump over. The second is the heavy steering in the stand, whereby only from approx. 1500 rpm-1 uses the steering power support. But that’s not my topic. Now in the information display the message “Sign up for service!” appears. The last oil change was made on 28.08.2015 at 248.400km. Now there are 261,200km on it. That’s a difference of 12.800km. That’s clearly too early! Also in the majority of city traffic. In the engine room is attached a sticker, which the oil quality ACEA A5/B5 with the viscosity SAE 0W-30 is always possible. Now my question is: I can’t a Audi A6 TDI 120kw took the interval to the oil fill up again. But I didn’t the oil fill up too cheaply the oil.