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Oil Viscosities



I live in Edmonton, and therefore deal with some relatively cold winters, it can be as cold as -40C or as warm as -5C regularly.  I have been running Castrol Syntec 5W30 oil in my '96 Jetta.  Today I went to two department stores looking for Syntec 5W30 and the only thing that I could find that was close was Syntec 5W50.
My question is, what difference would using 5W50 as opposed to 5W30 make in my car?
 
Thanks in advance.
Troy