Verified Car Spec Source: What It Means Here
What makes a verified car spec source, the four checks a number must pass here, and the figures we refuse to print so you never torque to a guess.
Short answer: a verified car spec source is a document that names the exact vehicle a number applies to and comes from the people responsible for that number: the manufacturer, a regulator, or the labels on your own car. We can confirm that such a document says what we quote. We cannot confirm that your particular car still matches it. That gap is why so many articles here end by sending you to your own label, manual or service information instead of handing you a figure.
This page explains the test we apply, the order in which we trust sources, and the categories of number we have decided never to print.
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Why "check your own manual" is not a dodge
If you have read more than one article on this site, you have probably noticed the pattern. You ask for a torque value, a fluid type or a capacity, and instead of a table you get a guide to where your number lives.
That is deliberate, and the reason is practical rather than legal. A model name covers a lot of variation: several engines, several transmissions, different wheel fitments, different markets, and changes partway through a production run. A single published figure for "the 2019 model" has silently picked one of those versions. If it picked a different one from yours, the number is accurate and still wrong for your car.
Your own documents do not have that problem. The owner's manual in your glovebox was written for your model and year. The labels on your car were applied to your car. Our guide to where to find vehicle specs for your car walks through every one of those sources in turn, and it is the page we point to more than any other for this reason.
The site's founder describes the same position on the Our Story page: if the site is not sure of a number, it says so rather than guessing. This page is the working detail behind that sentence.
The four checks a number has to pass
"Verified" gets used loosely online. Spec databases and VIN lookup services often describe their data as verified, accurate or cross-checked, and readers have no way to see what that word covered. So here is what it covers on this site. A figure has to clear all four checks before it appears in an article.
| Check | Passes | Fails |
|---|---|---|
| 1. Named primary source | The manufacturer's manual, service information or label; a regulator's database or rule; a standards body's published definition | "Industry sources", an unnamed forum post, another spec website, an AI chat answer |
| 2. Exact vehicle match | Model year, market, engine and, where it matters, build date or trim are all stated | "Fits most 2015 to 2020 models", or a figure with no vehicle attached |
| 3. Units and conversion stated | The original unit is kept, and any conversion is shown with its basis | A converted number rounded on its way between sites, with the original lost |
| 4. A date | We say when we read the source | An undated figure that may predate a correction |
A figure that fails any one of these is removed, not softened. We do not turn it into "around" or "roughly". On a page about wheel fasteners or brake fluid, an approximate figure invites the reader to use it, and a wrong number on a safety system is worse than no number.
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The source ladder: how a verified car spec source ranks
Not every legitimate source is equally authoritative for every question. The order below is how we rank them, from most to least authoritative for a specific vehicle.
| Rank | Source | Authoritative for | Its weakness |
|---|---|---|---|
| 1 | Labels on your own vehicle | Your car as it left the factory | Can be damaged, missing, or describe a car that has since been modified |
| 2 | Manufacturer's owner's manual and service information for your exact year | Specifications, fluids, procedures | May cover several versions on one page; you still have to pick yours |
| 3 | Government databases carrying manufacturer-reported data | Identity and certified ratings | Narrow scope; not a full specification sheet |
| 4 | A dealer parts or service desk working from your VIN | Parts and specifications for your build | Only as good as the question asked and the system behind the counter |
| 5 | Third-party spec databases and aggregators | A quick orientation | Source often unstated; errors copy between sites |
| 6 | Forums, AI chat answers and unsourced articles, including ours if we ever fail the four checks | Ideas about where to look | No accountability for the figure |
Rank 1 deserves a word of explanation. In the US, federal regulation 49 CFR 567.4 requires a certification label that carries the manufacturer's name, the month and year of manufacture, the gross vehicle weight rating, the gross axle weight rating for each axle, a statement of conformity with federal standards, the vehicle identification number and the vehicle type. For passenger vehicles and trucks it is fixed near the driver's door, typically on the hinge pillar, door-latch post or door edge. That label is the only document in this list produced for one specific car. Our guide to door jamb sticker meaning reads it line by line.
Rank 3 is where most readers do not think to look. NHTSA's vPIC site, read on October 2, 2026, describes itself as a consolidated platform presenting manufacturer-reported data collected under 49 CFR Parts 551 through 595. The same page states that vPIC is intended for model years 1981 and forward, and that its data covers vehicles intended for sale or importation into the United States. That is a useful pair of limits to know: a pre-1981 car or a vehicle built for another market will return thin results, and that is the system working as described, not a fault.
For fuel economy, the equivalent is FuelEconomy.gov, which, as read on October 2, 2026, calls itself the official government source for fuel economy information and says it is administered by Oak Ridge National Laboratory for the U.S. Department of Energy and the U.S. Environmental Protection Agency. If a spec site's mileage figure disagrees with it for the same vehicle, the government listing is the one to trust.
Rank 5 is where many search results come from, and it is the reason readers so often see two answers to one question. We cover that in detail in why two websites give your car two different numbers; the short version is that most disagreements come from different versions of the car, not from someone lying.
What we will not publish
These are standing decisions for this site, not case-by-case calls.
- A torque value without the exact vehicle and the exact fastener. Wheel, caliper and suspension fasteners vary by model, year and component. A generic "typical lug nut torque" table is exactly what we refuse to print.
- Any tire pressure figure. This site publishes no PSI number, ever. The correct pressure for your tires is printed on your own car's tire placard and in your owner's manual.
- A fluid type or capacity not taken from the maker's document for that vehicle. Not a "compatible" substitute, and not a capacity averaged across engines.
- A towing or payload figure without model, year, configuration and the maker's own source. People load to the headline number, and the lowest-rated part of the chain sets the real limit.
- Blended or averaged numbers. Combining three websites' figures into a range produces a number nobody published and nobody stands behind.
- A figure we found only on another spec website. If we cannot trace it to a primary source, we do not repeat it.
- A figure from an AI chat answer. Fast and confident is not the same as sourced.
- Spec lists for codes we cannot verify, such as full paint code or option code tables, where a single wrong line sends you to the wrong part.
Where a general figure genuinely exists, such as a unit conversion constant or a definition in a federal rule, we may state it, with the source named. Where it does not, the article teaches you the lookup and stops.
What verification cannot do
This section exists because a page about trust that only lists its own strengths is not worth trusting.
Verification confirms that a source says a number. It does not confirm the source is right. Manufacturers revise their documentation, and the version current for your vehicle is the one that governs, not the one we read on a given date. That is why a figure here carries the date we read it.
Verification also cannot see your car. A previous owner may have changed the wheels, the brakes, the engine or the tires. A mid-year change may put your car on the other side of a spec split. A replacement part may have different requirements from the original. None of that shows up in any document we can check from here.
And we are a secondary source. Even when we get everything right, we sit below your own labels and your own manual on the ladder above. If this site ever disagrees with your vehicle's documents, your documents win.
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How to run the same test on any source, including this one
You do not need to take our word for any of this. You can apply the four checks yourself in about the time it takes to read a spec table.
- Find the named source. If the page does not say where the number came from, treat it as unverified.
- Match the vehicle. Confirm the model year, market, engine and trim against your own paperwork, not against the badge on the tailgate.
- Check the units. Note whether the figure is in its original unit or converted, and whether anything was rounded.
- Look for a date. An undated figure may predate a correction.
- Compare against your own documents. If your manual, label or service information disagrees, stop there. Theirs is the higher-ranked source.
If a source fails the first check, the other four do not matter.
When the number is safety-critical
Some numbers carry more weight than others. Wheel fastener torque, brake fluid type, brake component torque, tire load ratings and towing limits are the ones where a wrong figure becomes a physical risk rather than an inconvenience.
For those, the right source is the manufacturer's service information for your exact vehicle, and the right person, if you are unsure, is a qualified technician or the dealer service department with your VIN in hand. This site can explain what the number means and where it lives. It should not be the last thing you read before you pick up a wrench on a safety system.
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Frequently asked questions
What counts as a verified car spec source?
A document that names the exact vehicle a number applies to and comes from whoever is responsible for that number: the manufacturer's manual or service information, the labels on your car, or a regulator's database such as NHTSA's vPIC or FuelEconomy.gov. A website repeating a figure without naming where it came from does not qualify.
Why doesn't this site just publish a spec table for my car?
Because one table cannot tell which version of the car you own. Engine, market, trim and build date can each change the correct figure, and a table that picks one version silently is accurate for that version and wrong for the others. Your own documents do not have that problem.
Are VIN decoder results verified?
A VIN decoder that draws on manufacturer-reported data, such as NHTSA's vPIC, is a strong source for your vehicle's identity. It is not a full specification sheet, and NHTSA's own page notes it covers model years 1981 and forward and vehicles intended for sale or importation into the United States.
What should I do if two trusted sources disagree?
Rank them. Your vehicle's labels and the manufacturer's documents for your exact year outrank everything else. If they still disagree with each other, ask a dealer parts or service desk to check against your VIN before you rely on either figure.
Does this site ever get things wrong?
Any secondary source can. That is why the rule here is that a figure names its source and the date we read it, so you can check it against the original. If our page and your vehicle's documents disagree, follow your documents.
