I know you have heard that groan or creak when opening a car door, especially in the winter time. Usually the best thing to do if to get a good spray lubracant and hose it down (I’ve found that P B Blaster is about the best). But! If you get caught without it like I did recently and it is your wife’s car door that is making the noise and you just can’t find the time to get to the store here is a hint on how to solve the problem. Open the hood. Pull out the dip stick(hopefully you have oil in your motor) and quickly take it to the door hinge that is causeing the problem and wipe the oil off on the hinge. In my case it was the part that holds the door open that caused the noise. It took a few trips back to the motor but it got the job done.