How we check
The problem with most fitment data online is that it's copied, and errors get copied with it. Our rule is simple: nothing is called verified unless we can show you why.
The rules
| Bulbs and wipers | Two independent sources agree, or one owner's handbook / owners'-club fitment list. Retailer fitment finders count as one source, never two. UK/EU specification only — US-market data is ignored even when it's the same model name. |
|---|---|
| Roof bars | Two UK dealers reproducing the Thule or Cruz fit guide agree on the foot + fitting kit + bar (or one dealer page plus Thule's own kit instruction sheet). The roof load comes from the handbook or a manufacturer accessory page — a dealer's “kit limit” is not the car's roof load, and we show whichever of the two is lower. Kits are for the most common body style; estates, 3-doors and rail-equipped trims are noted rather than guessed. |
| Engine oil | Manufacturer source only. The approval spec must come from the owner's handbook (or a faithful mirror of it), the manufacturer's online handbook, or the manufacturer's own oil-specification page. Retailers and oil brand finders agreeing is not enough — a capacity taken from those stays marked as approximate even when the spec is verified. |
| Source shown | Every card ends with its sources. Where the manufacturer hosts the document openly we link straight to it; where it is behind a VIN lookup we say so and link the lookup so you can confirm against your own handbook. |
Where the values come from
Sources rank in a fixed order: the manufacturer's own document first, a faithful mirror of the handbook second, UK owners'-club and per-model retailer fitment pages third, and everything else (generic finders, forums, US-market charts) only as a place to find candidates. The full hierarchy and how it is applied is in the editorial policy.
Research is done with AI-assisted tools that locate and read the documents; publication follows the rule above, not a judgement call, and a sample of cited sources is re-opened independently after each pass. Every value on a page is a stored record with its source and a “last checked” date — nothing is generated when the page loads. More on how automation is used.
Bulb pages also carry a UK legality note keyed on the car's headlamp type, citing the MOT inspection manual, because “which bulb” and “can I fit an LED” are usually the same question.
What the labels mean
Verified — meets the rule above for its category.
Likely / Candidate — the best value we have found, from sources that don't yet meet the rule. Treat it as a strong hint, and check the part you take off.
Unconfirmed (oil) — we haven't found a manufacturer document for that engine yet. We show the candidate values but don't recommend a product against them. Your handbook wins.
Approx. (oil capacity) — spec verified, capacity from a retailer or workshop source rather than the handbook. Fill to the dipstick.
Where each manufacturer keeps its handbook
| Make | Access | Where |
|---|---|---|
| Audi | VIN required | my.audi.com ↗ |
| BMW | VIN required | driversguide.bmw.com ↗ |
| Ford | Public | fordservicecontent.com ↗ |
| Honda | Public | honda.ie ↗ |
| Hyundai | Public | hyundai.com ↗ |
| Kia | Public | kia.com ↗ |
| Mercedes-Benz | Public | mercedes-benz.co.uk ↗ |
| Mini | VIN required | driversguide.bmw.com ↗ |
| Nissan | Public | nissan.co.uk ↗ |
| Peugeot | Public | public.servicebox.peugeot.com ↗ |
| Toyota | Public | toyota.co.uk ↗ |
| Vauxhall | Public | vauxhall.co.uk ↗ |
| Volkswagen | VIN required | volkswagen.co.uk ↗ |
Found a mistake?
Use the “Spotted a mistake?” button on any car page. Reports go straight to the verification queue and we re-check against the handbook. Photos of the relevant handbook page are the fastest way to get an unconfirmed engine confirmed.
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