Most of what people believe about car warranties is what a service advisor told them. This page uses three sources that outrank the service desk: the Magnuson-Moss Warranty Act itself, the Federal Trade Commission's guidance on it, and the manufacturers' own warranty pages. Where a rule has an exception, the exception is here too.
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A warranty is a promise to fix certain defects or malfunctions for a set time after purchase. The manufacturer's warranty on a new car is included in the price and usually runs for a number of months or miles, whichever comes first. A used car may carry what is left of the original one, or a dealer's own, or nothing beyond what the law implies.
The thing sold at the finance desk under the name "extended warranty" is not, in law, a warranty at all. The FTC's current guidance is direct about it: an auto service contract is an optional contract sold separately, by a manufacturer, a dealer or an independent company, and because you buy it separately it is not a warranty as federal law defines one. That distinction matters because the protections on this page attach to warranties. A service contract's rules are whatever the contract says, and the FTC notes those can require you to follow the schedule and keep records or lose coverage.
The most repeated warranty myth is that maintenance outside the dealer voids coverage. The FTC's answer is one word, no, and the law behind it is the Magnuson-Moss Warranty Act. The relevant sentence is short enough to quote: a warrantor may not condition a warranty on the consumer using any article or service identified by brand, trade or corporate name, unless that article or service is provided free of charge under the warranty. That is 15 U.S.C. 2302(c), and it is why a dealer cannot legally say your engine coverage depends on their oil changes.
An independent shop, a chain, or you in your own driveway can do the routine work: oil, filters, rotations, fluids, brake pads, belts. The FTC's guidance adds that it is illegal for a dealer to deny warranty coverage simply because someone else did that work.
Two limits, both from the same sources. If the warranty provides a service for free, the manufacturer may require you to get it from a facility it chooses, and the same is true of free parts. And a warranty covers defects, not damage: if a belt is replaced badly and the engine is damaged as a result, the manufacturer can deny that repair. The FTC's retired guidance put the burden where it belongs, though: the manufacturer must be able to show it was the bad repair, not a defect, that caused the failure.
15 U.S.C. 2302 (Cornell LII) and the FTC's guide to federal warranty law, which calls such clauses tie-in sales provisions.
Same statute, same answer. Your warranty stays in effect if you use aftermarket or recycled parts. The FTC defines an aftermarket part as one made by a company other than the vehicle's maker, and a recycled part as one built for and installed in a new vehicle, then removed for resale. A dealer that voids coverage because of the brand on your air filter is doing the thing the tie-in rule prohibits.
What the manufacturer can still do is decline to pay for damage that a part actually caused. If an aftermarket part fails and takes something else with it, that repair is arguable. The rest of the warranty is not.
Facts about auto warranties (FTC).
Every dispute in this area comes down to records. Follow the maintenance schedule in the owner's manual, not the dealer's upsell sheet; the manual is the document the warranty refers to. Keep every receipt and have each one show the date, the mileage, and what was done. If you do the work yourself, keep receipts for the parts and fluids and write the date and mileage on them. A claim denied for "lack of maintenance" is a claim you cannot prove you performed.
The FTC's guidance for service contracts makes the same point from the other side: the company can ask for your maintenance records, and if you cannot produce them, the contract may be void. Same folder, same habit.
The honest answer is that it depends on the manufacturer and on which part of the warranty you mean, and the only authority is that manufacturer's own warranty page. The basic new-vehicle limited warranty generally stays with the vehicle. The long headline powertrain coverage often does not.
Hyundai's own page is the clearest worked example. Its 10-year, 100,000-mile powertrain coverage applies to the original owner only for 2004 and newer model years. A second or subsequent owner gets powertrain coverage under the 5-year, 60,000-mile new-vehicle limited warranty instead. So the number a seller is tempted to advertise is not the number the buyer receives.
Before you list the car, read the warranty booklet or the manufacturer's site for your make and note three things: the expiry in months and miles from the original in-service date, whether any coverage is limited to the original owner, and whether a transfer requires a form or a fee. Then say exactly that in the listing. A buyer who discovers the difference after the sale has a complaint; one who was told up front has a reason to trust the rest of what you said.
Hyundai's warranty page, as the published example.
If your phone rings about your car's warranty "about to expire," that is not the manufacturer. The FTC has issued repeated alerts about auto service contract robocalls and the scams around them, and its guidance is to hang up. A real service contract is something you shop for, from a named company, with a written contract you can read before paying. Nobody who knows what your warranty covers is going to cold-call you about it.
What to know about auto service contract and extended warranty scams (FTC).
Remaining factory warranty is worth money to a buyer, and it is worth exactly what the manufacturer's page says it is, no more. Find the in-service date, work out what is left in months and miles, check the original-owner clauses, and put the true figure in the listing. Hand over the maintenance records with the keys; a folder of dated receipts is the single strongest thing a private seller can offer, because it is the thing the warranty argument always turns on.
If the warranty is long gone and the car has the problems to show for it, that is the end of the road we are for.
No. Under the Magnuson-Moss Warranty Act, 15 U.S.C. 2302(c), a warrantor cannot condition the warranty on using a named brand or service unless it is provided free under the warranty, and the FTC says it is illegal for a dealer to deny coverage because routine maintenance was done by someone else.
No. The FTC states the warranty stays in effect with aftermarket or recycled parts. The manufacturer can decline to pay only for damage a part actually caused.
Not in law. The FTC classifies it as an auto service contract, bought separately, and its terms are whatever the contract says. Those terms can require you to follow the maintenance schedule and keep records.
Usually the basic new-vehicle warranty does; the long powertrain coverage often does not. Hyundai's 10-year powertrain coverage is original-owner only, with subsequent owners covered under the 5-year, 60,000-mile warranty instead. Check your manufacturer's page and state the true figure in the listing.
Dated receipts showing mileage and the work done, following the schedule in the owner's manual. For do-it-yourself work, keep the parts and fluid receipts with the date and mileage written on them.