For drivers a parts store just told no
The alternator is dead again. The battery won't hold a charge. The box said lifetime warranty — and at the counter you heard one of the five sentences: "We can't find your purchase." "Our test says it's fine." "That's wear, not a defect." "That's commercial use." "One exchange only." The chains publish their warranty terms in full — and never publish how to use them. This site is the other half: where you actually stand under the written policy, the math checked for you, and the exact next move at the counter.
No login. No account details. Nothing uploaded. Ever.
Across AutoZone, Advance Auto Parts, O'Reilly, and NAPA — roughly 22,900 US stores between them — the fight is the same and the walls differ by chain. Before you argue, give up, or pay for a new part, you deserve to know what the written policy actually says about your case. That answer is free here.
A few picks. Nothing uploaded, no account, no login — the checker runs on this page, in your browser.
Likely rulings under the written terms — never a promised outcome. Your receipt's printed terms control over any general rule.
The record
The receipt faded, the sale was never typed into the warranty computer, or your name was spelled wrong when it was. An AutoZone employee's own account: there are 5 ways to look up a warranty, the front computer shows only the most recent items, and warranties are "entered incorrectly or not at all." The deeper search exists. Almost no customer knows to demand it. The lookup fight →
The test
The car says the alternator is bad; the store's bench machine says "all good" — and the machine wins. Paid experts answering these exact questions in public say the quiet part out loud: parts-store testers "may not be the most reliable." The documented counter-move is a second, independent test printout. The bench-test fight →
The word
Every published warranty here covers defects in materials and workmanship; none covers normal wear. So the whole brake-pad fight is one question: is what your part shows thinning — or delamination, cracking, and one-sided wear, which are defect patterns? Words end conversations. Photographs don't. Wear or defect? →
The downgrade
At Advance and O'Reilly this one is real and written: a part on a commercial-use vehicle drops to 90 days, "regardless of any longer warranty period printed on your receipt." The fights worth having are the count (are you inside the 90?) and the classification (is a personal truck that sometimes carries tools a commercial vehicle?). The 90-day rule →
The invented rule
Employees state it out loud; customers have had it confirmed at multiple stores. It appears in none of the four chains' published warranty documents. What IS in writing: O'Reilly covers a warranty replacement for 90 days or the rest of the original period, whichever is greater — and an AutoZone replacement battery's warranty keeps running from the original purchase date. It shrinks. It does not vanish. The one-exchange myth →
The math
When a battery dies after its free-replacement period, the credit is a formula — AutoZone's own published formula: (remaining months ÷ total months) × what you paid. That formula sits in a business-to-business document no shopper ever sees, so counter numbers go unchallenged. Ours is checked for you, on the checker, free. The proration page →
The honest frame: the warranties are real, and plenty of claims go fine when the record is found — a documented Duralast Gold case took 15 minutes once the record was pulled up by name. The pain is that the outcome depends entirely on the record, the test, and the person behind the counter — and customers walk in knowing none of the levers. This site publishes the levers: the chains' own terms, quoted and date-stamped, the tactics employees and mechanics have documented for a decade, and the ladder above the store (AutoZone 1-800-288-6966 · Advance 1-877-238-2623 · O'Reilly Warranty Administration 1-866-830-4351).
The checker tells you where you stand. The kit is the working papers for the whole fight — written for the moment you're standing at the counter with a dead car and a story you didn't expect to hear.
One payment, yours to keep. You do every step yourself — at the store, on the phone, in writing; we never call a store for you. See everything inside the kit →
Not on the written record. AutoZone ties purchases to your phone number in a national database — and an employee's own account says the front counter sees only a slice of it, with the full record on a back-office server. O'Reilly's published terms demand the original receipt in bold — and confirm in §1.1 that a national warranty database exists. In both cases the deeper search is the demand. Run your case through the checker for your chain's exact move.
Possibly you. A bench test can pass a part that fails under load and heat, and mechanics answering these disputes in paid Q&A say so about store testers directly. The documented counter-move is an independent test printout from a rival store or an electrical shop. See the bench-test play.
No — and yes, in a narrower way than the belief. The written warranty covers defects in materials and workmanship for the stated period; it does not cover a pad worn thin by use. Delamination, cracking, and uneven wear are defect claims. The brake pads page separates the two against the text.
By the formula. AutoZone publishes it: (remaining warranty months ÷ total warranty months) × original price. If the store's number is lower on the same inputs, ask for their math in writing. The proration page works examples, and the checker runs your numbers free.
No dedicated one exists — diligence for this site checked Gumroad, Etsy, Upwork, and standalone products and found no paid parts-warranty help for consumers at any price. People pay per-question on expert Q&A sites instead. This site sells the map and the paperwork for $39, once; you run the fight yourself, with the chains' own documents in hand.
Policy facts checked Oct 20, 2026 against each chain's published warranty documents. Store counts: ScrapeHero location data, Oct 2026. Every fact on this site carries its source and date — and where a term comes from your purchase era, the site says so.