I personally use the Castrol 0W-40 that meets the VW 502 spec. Per the Bob is the Oil Guy forums, it’s one of the best oils out there and is available at a great price from Wal-Mart, at ~$25 per 5qt jug. I’d use this oil in any VW and not think twice.
Note - I would only use a 504 oil if I did regular oil analysis to determine when the oil needs to be changed, since 504 oils are designed for markets with low-sulfur gas and the US doesn’t yet mandate the use of low-sulfur gas. The 504 oils will not last for extended drain intervals (>5000 miles).
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One of the best oils? It's a blend of about 50% synthetic and 50% fossil oil so how does it qualify?
And VW specifies 10,000 mile oil change intervals for oil that doesn't protect for more than 5,000 miles?