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Corrosion protection from the factory on new vehicles these days is worlds better than it used to be. There is a very heavy use of plastics and high-tech coatings. Add-on undercoating can actually promote corrosion, it can seal in crud that's already been deposited.
For carpets and upholstery, you can do the same thing yourself with a spray can of Scotchgard. For the exterior finish, standard detailing including sealants and waxes are as good, if not better, than any of these profit margin builders.
If you live in a high salt area, you can't beat a simple undercarriage wash periodically in the winter when weather permits.
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2003 F150XL 4.2 short cab/bed 4x2 5 speed manual 3.55 LS
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