I am a simple oil tech. Had a Volkswagen Jetta TDI come in. Oil filter located under hood. Got down to drain oil and found this. What is it? Google had been
Volkswagen Jetta Superwagen (2007 – 2013) – prescribed type of engine oil
What's correct oil VW PD TDI engines? Choosing the right spec oils for Volkswagen PD Diesel engines - YouTube