Can I get a new car? Read description for details?

I want to get a new car. My current car, however, is not paid off yet. I have a co-signer for my loan on the car and my mom told me that since I have a co-signer I cannot (or should not) get rid of it and get a new one but she didn't explain why. Is this true? I owe about $4,000 more on my car. I want to trade... show more I want to get a new car. My current car, however, is not paid off yet. I have a co-signer for my loan on the car and my mom told me that since I have a co-signer I cannot (or should not) get rid of it and get a new one but she didn't explain why. Is this true? I owe about $4,000 more on my car. I want to trade it or sell it to get a new one.
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