Originally Posted by PratoN
At temperatures that low, it sounds like your car would need a 60%/40% or 70%/30% (which I don't even think is recommended) coolant to water ratio. And I'd say screw Ford and get some Mobil1 full synthetic 0W-20.
Also, what temperature does oil freeze at...?
I have no clue, I'm going to make sure I get the service guy to document that he said no to a lower viscosity oil. He said since he used Motorcraft 5W20 Semi-Syn it's fine even this cold... I just don't want to void the warranty, I've only got 7000kms on it.
I called the shop, they're looking at it now. Will update you guys. Whoever decided that living at these latitudes was a good idea