My belief for changing oils at 7500km is that (IMO) the recommended interval is a compromise between reducing the service costs (in comparison with other cars) and changing the oil at a suitable time. By changing the oil at 7500km and using a VW approved oil (Mobil 1 0w-40 for me), I am confident that I always have oil in top notch condition protecting my engine.
If I left it for 15000km (I do about 18000km a year), I would feel around that 12-13000 mark that the oil is just not as good as it was when it was 2-3000km old.
Like I said, this is my belief and opinion, it makes me feel better and to be honest that's all that matters
NickZ
Former ride: MY07 Black Polo GTI
Current: MY09 Blue Passat R36 Wagon
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