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I was told by dealership that Mitsubishi does not like undercoating done on their vehicles and may even void warranty. The only time it is ok is when car wash applies the rust inhibitor coating.
 

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Modern vehicles are protected from the factory and you don't need it, says Consumer Reports. You don't need additional undercoating, and some types can trap water and rot out your car prematurely. While it won't "void" your entire warranty, it opens the door to deny any warranty claims impacted by whatever undercoating you used.
 
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