Seven car upsells to turn down before you sign

Most of these get sold to you in two places. One is the finance office, after you've spent three hours negotiating and want to go home. The other is the service lane, where a friendly guy with a clipboard walks out to the waiting room with "a few things we noticed." Both are built on the same idea: you're tired, you've already said yes once, and saying no feels rude. It isn't. Here are seven to decline, and what to do instead.

The second sticker

What it promises: Protection and polish. Pinstripes, door edge guards, "appearance packages," and sometimes a bundle of several items at once.

Why skip it: Look at the window of a new car and you'll often find two stickers. One is the factory sticker with the real price. The other is the dealer's addendum, with extras already listed, already installed, and already priced as though you wanted them. You didn't. The add-on price is the dealer's own number, and nobody regulates how fat it is.

Do this instead: Ask for the out-the-door price in writing, with every line itemized. Then ask which items are optional and which can come off. If something is already bolted to the car, say you'll buy the car without it or at a price that reflects it. Be polite about it. Be immovable about it.

When it's worth it: When you actually wanted the thing, like a hitch or all-weather floor mats, and the price holds up against what a parts store charges. Check the current price on the same item elsewhere before you agree.

VIN etching

What it promises: Thieves won't steal a car with its vehicle ID number etched into every window.

Why skip it: It's a stencil, some acid paste and a few minutes of work. Dealers have sold it as a premium service. Whether it deters anyone is a question for a police department, not a sales sheet. Skip the add-on price.

Do this instead: Call your insurance agent and ask two questions. Do you give a discount for etching? And does it matter if the dealer did it? Kits for doing it yourself are sold at auto parts stores. Check the current price.

When it's worth it: If your insurer pays a discount that's bigger than the cost of the kit, and you'd rather do it yourself than pay the dealer. Get the discount in writing first.

Fabric and paint protection

What it promises: Spills bead up. Bird droppings won't touch the paint. The finish stays showroom-new for years.

Why skip it: The dealer's package is usually a spray that anyone can buy in a can. Say the dealer charges $400 for it. That's an example, not a quote, but the pattern is real: a small product, a big markup. Read what the contract actually covers. Many of these come with fine print requiring you to bring the car back for inspections, and the "warranty" pays out only if you did.

Do this instead: Wash the car often and wax it a couple of times a year. Buy a can of fabric guard and spray the seats yourself on a dry afternoon. Put rubber floor mats in the footwells and keep a roll of paper towels in the glove box. A kid with a juice box will test it whether you've protected anything or not.

When it's worth it: A professional ceramic coating on a car you plan to keep a long time can be a fair purchase, if you're buying from an independent detailer you've vetted and not a dealer's package. Ask exactly what it covers and what the guarantee requires of you.

Nitrogen in the tires

What it promises: Tires that hold pressure longer and run cooler, for a fee per tire.

Why skip it: The air you breathe is already about 78 percent nitrogen. You're being charged to swap that for slightly more of the same stuff. The real tire problem is almost always low pressure, and no gas fixes a person who never checks it.

Do this instead: Buy a decent pressure gauge. Look at the sticker inside the driver's door jamb for the pressure the maker recommends. Not the number on the tire sidewall, which is the maximum. Check cold, once a month. The gauge costs less than a single fill-up of nitrogen across four tires.

When it's worth it: When it's free. Some shops do it at no charge, and there's no harm in it. And if a shop tops your nitrogen tires off with regular air in a pinch, nothing bad happens.

Rust proofing and undercoating

What it promises: A sprayed-on barrier that keeps salt and moisture from eating the frame.

Why skip it: New vehicles come from the factory with corrosion protection already built in, and most makers publish a corrosion warranty in the owner's manual. Read yours. A dealer-applied coating can be sprayed over spots that should have been left clean, trapping moisture where it shouldn't be. And the application is only as good as the person holding the nozzle.

Do this instead: Wash the underside of the car during winter whenever the temperature climbs above freezing, and again in spring. A pressure wash with an undercarriage spray gets salt out of places you can't reach. Fix chips in the paint before they bloom.

When it's worth it: On an older vehicle you plan to keep, in a region where roads are salted all winter, applied by an independent shop that does only this and will show you the work. Get the process and the guarantee described in writing.

The quick-lube extras

What it promises: You came for an oil change. You leave with an engine flush, a fuel system cleaning, a new cabin filter and a lecture about your air filter, which a man held up in the waiting room and called "pretty rough."

Why skip it: The maker of your car already wrote down what it needs and when. It's in the owner's manual, in the maintenance schedule section. If an extra isn't on that schedule, ask why it's being recommended. "We recommend it" isn't a reason. A dirty-looking air filter might be fine. A filter in a paper bag you're shown while sitting in a waiting room isn't evidence of anything.

Do this instead: Bring the manual's schedule with you, or pull it up on your phone. Say yes to what's due and no to the rest. Our piece on the car servicing that can't wait, and the kind that can sorts it out. Keep every receipt. The Federal Trade Commission's consumer guidance says a dealer generally can't void your warranty just because you used an independent shop, so long as the work was done right. The receipts are your proof.

When it's worth it: When the manual calls for it, or when a trusted mechanic points to a specific problem and shows you the part. A flush isn't evil. An unexplained one is.

The extended warranty in the finance office

What it promises: Peace of mind. No surprise repair bills for years.

Why skip it: Don't buy it on the spot. It's a service contract, and the price is negotiable, often by a lot. The finance manager is under no obligation to mention that. Who stands behind the contract matters too. Some are backed by the maker. Others are backed by a third party you've never heard of, and the claims process, the deductible and the list of exclusions are where these contracts either work or don't. Read the actual document, not the brochure.

Do this instead: Put what the contract would cost into a separate savings account and call it the car fund. If the car never needs a big repair, the money is still yours. If you want coverage anyway, ask whether it can be bought later, and compare quotes from the maker's own program. For picking a car that doesn't need one, see the used cars still worth buying and how to spot one.

When it's worth it: When you're buying a model known for expensive repairs, a single big bill would genuinely wreck your budget, and the contract is maker-backed with clear terms. Check what it excludes, who pays labor and whether you have to go back to the dealer for every claim. Never sign it the same day you sign for the car.

How to say no at the counter

You don't owe anyone an explanation. A short sentence, said calmly, does more than a long apology.

• "No thanks, I'm good with just the car."
• "Put it in writing and I'll think about it at home."
• "Take that line off and give me the new total."

Say it, then stop talking. The silence will feel longer than it is. If they push, say it again in the same words. You're not being difficult. You're being the one person in the room who is spending your family's money like it matters.