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Originally Posted by dakota
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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Very interesting! Thanks.
I'd never have thought however that the 15w50 would be suitable for canadian winters. But after reading your post, I Google searched and double checked it at the following site:
More Than You Ever Wanted to Know About Motor Oil and you're absolutely right.
So I'll just use the 15w50.
Thanks again!