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You can get static when the car's speakers and the device are using the same power source. A ground loop filter should take care of it. You just need one which has matching jacks for your device. Here's a popular one on Amazon for $7 ...
https://www.amazon.com/BESIGN-Ground-Isolator-Stereo-System/dp/B06XQYN77L/
https://www.amazon.com/BESIGN-Ground-Isolator-Stereo-System/dp/B06XQYN77L/