Welcome to the balmy Canadian winter,
Your block heater heats the engine coolant, not the engine oil. Your 5W30 engine oil is still liquid (not solid) at -35C.
Get your battery re-charged to full power. A little battery charger from Canadian Tire is only about $30.00 and could be handy.

What are the specs of your Bio-diesel (pour point, cloud point, flash point???).