Methodology
How we verify vehicle data
WhichCarParts answers one kind of question: what does my exact car need? Not reviews and not news, just the ownership facts, organised by year, make, and model.
Where our data comes from
Every specification starts from primary sources: manufacturer owner's manuals, official maintenance guides, and NHTSA recall and complaint data. We cross-check against major parts-fitment databases, and the sources behind each generation are listed at the bottom of every vehicle page.
If you spot an error, we want to know. Accuracy is the entire point of this site.
What the confidence labels mean
Not every number deserves the same trust, so we never present them as though it does. Each specification carries one of three labels.
- Verified
Confirmed directly against the owner's manual or manufacturer documentation for that vehicle. This is the standard we aim for on every safety-relevant figure.
- High confidence
Consistent across multiple reputable parts and fitment databases, but not confirmed against a primary manufacturer document.
- Check your manual
Reported by aftermarket sources only. We say so plainly and tell you to confirm the figure before you act on it.
A note on safety
Before you service anything
Specifications vary with engine option, production date, and market. Confirm against the owner's manual for your specific vehicle, the tyre placard on your door jamb and the labels under your hood are the final word for your exact car.
Photography
Photographs on this site come from Wikimedia Commons under free licences, and are illustrative rather than specific to a given trim or model year. Every image is credited to its photographer on the credits page.
