My undercarriage looks really good after 15 years. I do the undercarriage wash every time I go through the touch free, particularly in the winter, and all the bolts and hangers underneath look great.
The subframes however, suck. I've already replaced both due to heavy rust and corrosion, and had the replacement treated with POR 15, which has held up amazingly.
My mechanic did my calipers with the POR too, which looks great and should help extend their life.
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