To change or not to change

Hello all.I have Mobil 1 5W-30 in my ecotec.I have put on 4000 km since the start of June when I changed it.Winter in Canada is coming and i'm wondering if its o.k. to keep it in till spring (April).My olm is at 62% right now. My trip to work takes 1/2 hour of running time each way.What do you guys think? BTW this is my first run of synthetic , i have 85000 km on the car.
Cocoa, FL
Does the manual spec anything alternative for "below freezing" temps? Most "temperature to oil visc. charts" I've seen seem to say that 5W-20 and 5W-30 are very "robust, in that they can be used below freezing, and [censored] near above 100oF.... Does it typically get "below freezing" in your area? I suppose if you were really concerned, you could drain the oil into a clean drain pan, rebottle it into a 5 quart jug marked "GOOD OIL" and save it for the spring....if you were "that" worried anyways...


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My manual specs conventional 5w-30.also if the temps get below -20F then you can use a 0w-30 or 5w-30 synthetic(which i am using right now).The temps get down to (drumroll) -40F on occasion here,typically -20F to -30F.Bet you're glad you live in Florida!
You should be fine with a 5W-30 syn. I live in Edmonton and that's the viscosity of syn that I run year round. 0W-30 or 0W-20 would be better winter choices, though. I will likely switch to whatever the new name that XOM gave to the Esso XD-3 0W-30 once my stash of QSUD 5W-30 runs out as long as I can get it at a good price from a local distributor.