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There is nothing particularly wrong with mixing viscosities, despite what some have said. The problem is that you never really know what you get. You can't just average the weights and volumes and come up with the resultant viscosity. It's much more complex than that.
But one problem with your mix is that I don't think Mobil 1 5w30 is an approved oil for MB engines. As near as I can tell, in North America, the only two viscosities of Mobil 1 available and approved are 0w40 and 15w50.
While the Mobil 1 0w40 would probably be best for you in winter Canada, the 15w50 weight has a pour point of -45°C and a -37°C pumpability temperature. Easily suitable for your climate.
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