Quote:
Originally Posted by JEBalles
And fantastic lubricative properties.
On a serious note though, I put in 15W40 this summer and I'm not due for a change til february. I'm in the same climate as the OP, should I change it now, or can I tough it through?
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If it were me I would change it. It will start much easier in weather below freezing.
Another user on here tried to make it through his first winter here in MN with dino oil.
It wouldn't start at 4F. He switched to synthetic the next winter and cold started it near -20F.
Not only does it make a difference in how cold the car will start in, it provides better protection for the engine since it flows better right away when the engine starts turning.
I too run 5w-40 all year. I used to run M1 but they raised the prices and now it is about $7+ difference a gallon around here so last spring I switched to Rotella.