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i do this to have a higher viscosity at 100°C

Hello guys this is two analysis. It's a bmw 335i N54 tuned (single turbo 550whp full e85) with 69500 miles for the first analysis and 75800 for the second. The first is rowe hightec synthetic RS 5w40 The second is a Shell helix ultra mix (1/3 10w60 helix ultra 2/3 5w40 helix ultra). The oil have...