I tryed to start my car last night in the cold, -21C and it turned over once and then just bogged out. Then i tryed to more times and its would turn over but then nothing.

I recently put 20w50 in becasue of a leaking ring, but i dont think this is an issue since i ran it all last winter.

Could it be a fuel issue? Filter, Pump? I know these are expensive parts any solutions?