Q: I live in Southern New England and, in the past, I have had problems with undercarriage rust ruining brakes, mufflers and even the frame of the car. I get the same story: Drive it more, keep it ...

Unscrupulous auto dealers trying to aggressively push rustproofing is generally thought of to be a scam nowadays. Even the folks at Consumer Reports recommend skipping it. Well, I'm not going to ...