Just got my second set of analysis results. See below. The results are 20k miles apart and both tests are with 6k miles on the oil. I always use genuine VW oil made from unicorn poo and angel dust. Both sets of results suggest a "sooty" engine and that the oil should be changed more frequently than 10k miles, certainly more than the silly 20k long service interval. I do around 8k miles/year, mostly long journeys towing a trailer. Thankfully the engine gets a clean bill of health. 204ps Bi-TDI








