......or are they already repairing it...Would Nissan Help? Nissan is glad to help with u wallet.
Air Salinity/Acidity, car storage conditions, wash/waxing, road conditions(loose gravel, salt) dictate how soon the chassis starts to rust. After initial start, rust may be 'impossible' to fight as/if zinc layer has already been depleted. Oil is the only answer that wants to seep into inaccessible cavities and push moist out. That is why ultralight aircraft use oil in the support beam tubings: no secret inside rust allowed. The problem applying oil is, paint on oil isnt going to stay too long...
Typical defense is to scrape/clean and paint various coatings. That is good on parts /surfaces seen, the problem 'is always' on this planet in the unseen world...
After getting rust 'booted', well ventilated garage and lots wash/waxing will keep u max shiny.
No rust spots on my -93 Maxima, in salted Finland, clic on
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Heres an example how oil 'heals' your car chassis cavities: it seeps through cavities even after two years, pushing moist out. As the whol chassis lis aliving /bending system, the oil film works 'actively' for long time.
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