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Maybe that SLX OE 5w-30 will be doing its job, or VW dealers might be able to get some Euro oils that have the newer standards, such as 504 00, 507 00.
Unfortunately, the Euro oils don't do any better. What do you think the factory fill is? Tada, 5W30 oil formulated to the 504 standard. I can't say for other VW/Audi engines, but I can say conclusively that for the RS4 engine, the factory fill is no better than other "approved" oils that we've tested.