I Do This For The Glory
Join Date: Dec 1999
Location: Nobleboro, Maine
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Re: kinda O/T How does cold weather affect autotrannys
I always warm up my auto in the morning when it's cold, and it never has a problem. It also has 179,000 miles on it (4L30E) and I have changed the fluid 3 times. Most newer autos have a thermal interlock on the overdrive, so it won't shift into it until the temperature has come up. It should shift a little sluggish until properly warmed up, so the shift points will be higher. It's nothing to fret about, it's normal.
Up here it gets VERY cold, I have seen cars not start due to the oil being too thick to move, they had to be dragged inside and warmed up before they'd turn over fast enough. I have also seen people just jump in and run the vehicles, without warming them up, and blowing the motor. I have also seen it so cold that off-road lights crack their lenses when they're turned on. But, never a problem with an auto tranny, the fluid seems well adapted for use in the cold. In fact, I use it instead of grease in my hubs because the ATF won't solidify, even at extreme temperatures, so the hubs are always easy to turn.