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Mobil 1 5w50 is the factory fill for the Mercedes SLR (which is likely to see high fuel dilution and high temperature extremes). Can be that bad an oil.
Miro from "Synlube 4 life" reckons 5w50 is best grade for engine life. All most may not agree with his OCI intervals.
Currently trying out Fuchs 10w30 Super GTO MC oil a fully synthetic group III, I have used 5w50 supersyn when on sale.
How is the performance and FC after using Fuchs?