its kinda very cold out, and if you run some heavy oil like 10w40 it will thicken up. If you dont have any leaks Id suggest using some thin oil for the winter. I use 0w20 in my GFs car, but I use 10w40 cuz my front crank seal is leaking.
you can add a 1/3 bottle of sea foam in the oil and drive for 200 -300 miles and do an oil change. It will get rid of sludge.
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