Golf IV & Jetta IV
I searched but could not find posts for my particular engine on the topic.
I have a 2004 Golf 2.0L non-Turbo, engine code BEV, 211k miles.
From the time I bought the car in 2011 until 2016, I ran the manufacturer recommend motor oil, which is 5w-20 iirc, I think it called for synthetic as well...