underbody/engine block rust prevention?

Alexus

Unless you get harsh winters in a city where the plowmen like to spread a crap load of corrosive rock salt and calcium on the streets, or if you're in a coastal city where you get a lot of sea breeze and fog, you will not need rust proofing or any sort of undercoating. That being said, it's definitely not a bad thing to be safe rather than sorry, but in all honesty today's cars don't rust like they did, heck, two or three years back. If you keep a good coat of wax on your sheet metal and don't let your car sit unattended, outdoors, for too long you shouldn't have any problems. Undercarriage oxidation will eventually occur, but any rotting of the rocker panels, frame or sub-frame is highly unlikely in this day and age.

If your car won't see any winter, you shouldn't have to worry about it.

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