Its been extremely cold here in NYC this past month. I have been noticing a knock when I start up the car in the morning, just for a couple of seconds. I recently did an oil change with Mobil 1, 5w-20, still hear the knock on the start up. Should I switch over to 0w-20 until the spring? I saw heeltoe has published an 0w-20 application guide. Is anyone running 0w-20? Anyone else getting this knock on cold days?
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