Rick,
What does it normally get down to in the winter there?
I've seen 27 below but normal winters we may see a few days in the sub zeros. Normally a week or two max..
My sister lives in MT and all of her outfits have ever seen is 5w-30 dino the last few years.
Before, they ran 10w-30!
Lets face it, do all the cars in Alaska use Syn? no. 50% of them? No. I'd bet it's way less than 10% and cars are working and lasting up there.
I've started cars both on Syn and Dino and Blends and at single digits it made no difference. I start it up wait 30secs and drive softly until it warms up. I'm at 2800 rpm within 2 mins and UOAs show low metals. My other cars/trucks have seen high hundreds / 200k+ miles with no problems.
I think in real low temps, plugging it in works much better than Syn oil for helping the super cold start.
I know in Air Cooled Airplane motors, once you get below 32 degrees, pre heat is really needed and it does not matter what oil you use. The engine manuals state this.
But, in the end it's what you want to do.
I plan to keep my Corolla till it's end and get at least 300k on it. As fast as I'm putting on the miles, we will see sooner than later!
It will be no problem to make it. Heck, if my old 1986 VW jetta can make it to 260k and show no signs of slowing down using yesterdays oils, with todays conventional oils its much eaiser.
Some people will disagree and spend the $$. Thats ok, it's their $$.
You'll notice that the Toyota Manual shows use SL oil (my 2005) and shows 5w-30 from -20f to 100f+ and -29C to 38c+. Says nothing about Syn anywhere in the manual (I just looked).
The only difference I see for Canada is anti-freeze. USA use 50/50 and Canada use 55%/45% water.
So Rick, How cold has it been so far since you've owned the car and how is it running? I can tell you there is dino oil in there right now.
Take care, Bill