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unless someone can tell me that there are feminine words out there with an -us ending.
The fourth declension is a group of nouns consisting of mostly masculine words such as fluctus, fluctūs m. ('wave') and portus, portūs m. ('port') with a few feminine exceptions, including manus, manūs f. ('hand').
https://en.wikipedia.org/wiki/Latin_declension#Fourth_declension_(u_stems)
I think it's a proper noun. But, you can choose your gender, as it's not a Latin word. So, we're just making it up. It will depend on how you refer to your car. If you refer to it as a woman, then you're probably stuffed, unless someone can tell me that there are feminine words out there with an -us ending.