Like you say, the specification numbers sort of overrule oil viscosity ratings. Nowadays, it's important to understand how the lubricating properties are affected by temperature, age, pressure, and various other factors. The V10 S8 was something like 502.00, but the oil specification 504.00 superceeds that. Providing the oil meets the specs, there's no reason to say the oil couldn't be 0w20 or 15w50, just as long as it met specification.
A good example is Fiat. The 1.4multiair used in the 500x takes 5w40, but the 1.4multiair used in the Abarth 595 uses 10w50. Same engine, different use and different specs.
The Castrol Edge 10w60 is branded a racing oil, but conforms to 505.01 and 505.00.
I'd use this oil at your own risk, since most S8's aren't driven at the peak end of their performance, and perhaps if the vehicle isn't under this sort of load, the oil pressure or temperature may not be sufficient to protect the engine properly?
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Current: MY2019.5 Ford Ranger Wildtrak 2.0 BiTurbo
A8/S8 - A gap to fill.
Multi-Franchise Main Dealer during the day, Amateur vehicle enthusiast by night.
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