I wonder how much the higher cold vis # helped?

Here's the viscosity comparison:
V@40c / 100c / HTHS
10w40 = 95.9 / 14.71 / 3.9
0w40 = 75 / 13.5 / 3.8

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Current Vehicles: 2001 Mercedes E320 Wagon | 1979 Mercedes 220D | 1995 Volvo 850 Turbo Wagon | 1993 Volvo 240 Wagon

Kool 28% more viscosity. Wonder if that contributes? Do you have a link to a chart for a full range of viscosities? I'd like to look at some.