Yesterday i was speaking to someone at work about oil and fuel contamination and he mentioned that someone on his team worked on the calibration for the 2Litre TFSI engine for Audi and fuel contamination in the oil was a big problem during cold starts.

He then mentioned that his collegue worked on the fix for the problem and that there was an ECU update being carried out on these engines to reduce the problem.

I would think that there maybe other changes within the ECU update and not just the cold start update.