It's currently -2 degrees Fahrenheit outside (Chicagoland area). My '94 T-Bird is sitting out in my driveway with 5W-20 in it for the first time in temps this cold (I've always used 5W-30 in the past). We'll see how it starts in the morning! These kinds of nights would always make my first few seconds after startup an unbearable, noisy experience. If I had bought one of those oil pan warmers, I wouldn't be worried right now...
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