Why Two Websites Give Your Car Two Different Numbers
Five structural reasons published car specs disagree, and a ranking system for deciding which of the sources in front of you to believe.
Short answer: most of the time they are not contradicting each other, they are describing different cars. Different configuration, different market, different point in the production run, or a figure that has been converted and rounded on its way between sites. Occasionally one of them simply copied the other and inherited an error. This page names the five causes and gives you a way to rank the sources actually in front of you.
We should be direct about something: this site is one of the sources you should be ranking. The ranking below puts us near the bottom, deliberately, and the last section explains why that is the honest place for us to be.
Cause one: a different configuration is assumed
This is the most common cause by a wide margin.
A model name covers a great deal of variation. The same nameplate in the same year can have different engines, different transmissions, different axle ratios, different wheel and tire fitments and different equipment. Many published figures depend on one or more of those.
When a site publishes a single number for a model, it has silently picked a configuration. Usually it picks the one that produces the most impressive figure, sometimes it picks the base one, and it rarely tells you which. Two sites making different silent choices produce two different numbers, and both can be accurate for the configuration they had in mind.
The fix is to establish your configuration first. Your option or RPO sticker and your trim are where that starts.
Cause two: a different market version
Vehicles sold in different countries under the same model name are frequently different vehicles.
Equipment differs, engines differ, regulatory requirements differ, and the specifications follow. A figure published for one market can be perfectly correct there and wrong for a vehicle sold elsewhere.
Search results do not sort themselves by market. A page written for another country will sit next to one written for yours and look identical, and neither will announce which vehicle it is describing. This is the single most under-recognized cause of confusion in this entire subject.
Cause three: a mid-year or build-date change
Manufacturers change specifications during a production run without changing the model year.
When that happens, one source may reflect the pre-change vehicle and another the post-change one, and both are describing something real. Neither is wrong; they are describing different halves of a model year.
The tell is a parts catalogue that splits one model year by build date. That split is a change announcing itself. Full detail: model year vs build date.
Cause four: unit conversion and rounding
A figure that has passed through a unit conversion is rarely the same figure that went in.
Converted numbers get rounded, and rounded numbers get re-converted, and after two or three passes between sites you have a value that differs from the original by a small but real amount. On a torque figure, a small difference is not automatically dangerous, but it is a sign you are looking at a copy rather than a source.
The signal to watch for is suspicious tidiness. A figure that is a round number in one unit and an awkward one in another was probably specified in the first unit. A figure that is awkward in both has usually been converted twice.
Cause five: one site copied the other
A great deal of published vehicle specification data is copied.
The consequence matters more than the ethics of it: two sources agreeing is not confirmation if one came from the other. People treat agreement between three websites as strong evidence, and it can be exactly as strong as the single source all three copied.
There is no reliable way to detect this from the outside. What you can do is stop treating agreement as evidence and start asking each source where its data came from. A source that says is more trustworthy than three that do not, even when it is outnumbered.
How to rank the sources you have in front of you
| Rank | Source | Why |
|---|---|---|
| 1 | Your own vehicle: labels, codes, the component itself | Describes your car, not a model |
| 2 | Manufacturer service information for your VIN | Built to describe your specific vehicle |
| 3 | Factory service manual for your model year and market | Authoritative, but at model rather than VIN level |
| 4 | Owner's manual | Correct for what it covers; covers less than you need |
| 5 | Subscription repair databases | Aggregating tier 2 and 3, inheriting their errors |
| 6 | Everyone else, including this site | Secondary at best |
Two adjustments to that ranking. On a modified or repaired vehicle, the car itself can beat its own labels, because a label describes the original build. And a document for the wrong market drops out of the ranking entirely regardless of how authoritative it is, because it is describing a different vehicle.
How to get into tiers 2 and 3: owner's manual vs service manual vs repair database.
The tie-breaker, and why this site sits near the bottom
When two sources disagree and you cannot establish which configuration each is describing, the tie-breaker is not a third website. It is your own vehicle's documentation, or a dealer parts or service department with your VIN.
That is also why we place ourselves at rank six. We cannot verify manufacturer specifications across the thousands of model year, trim, engine and market combinations on the road, and a specification we cannot verify for your exact vehicle is not something we are willing to publish. A wrong torque figure or a wrong fluid specification is not a bad article; it is an injury or a destroyed component.
So this site teaches the lookup instead. Where a general answer genuinely exists with a citable source behind it, we give it and name the source. Where it does not, we tell you which of your own documents holds it: where every number on your car actually lives.
Frequently asked questions
Three websites agree on a number. Is it right?
Not necessarily. Copying is widespread in this subject, so three sources agreeing may be one source repeated three times. Ask where each got its data rather than counting agreements.
Why does the manufacturer's own figure differ from what I found?
Usually configuration or market. The manufacturer is describing a specific build; the other source has silently assumed one.
Which source should I trust for a torque figure?
Manufacturer service information for your vehicle, or a factory service manual for your model year and market. Not a general chart, and not this site, which does not publish them.
How do I know if a page is written for my market?
Often you cannot tell from the page itself, which is the problem. Prefer manufacturer sources for the market your vehicle was sold in, and treat unlabeled figures as unverified.
My car does not match any chart I can find. Is something wrong with it?
Almost certainly not. Configuration, market and build-date differences explain the great majority of mismatches. Your own documentation is what settles it.
