Her car isn't your problem. I wouldn't waste any time on it, if she wants to blow it up let her. Maintaining someone else's car isn't your responsibility. Unless you're getting paid to do it, who gives a **** as long as it isn't your car.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k