Haves1979
It has been serviced 4 times 9k 2014, 12k 2016, 19.5k 2017, 28k 2020 and is a 2011 61.I would question what "regular servicing" means on a vehicle that has only done 30K and is presumably at least 5 years old? If the vehicle is on the VW long-life service plan, a mileage of 30K might mean it's only had one oil-change service.
I suspect that an annual oil change (regardless of low-mileage) would mitigate most of the issues. I use the same regime for oil changes that I do for baths, "Once a year whether I need it or not".