Last updated: 22 August 2026
CarCompatibility.com publishes fitment guides for UK cars — which
battery, bulb, blade, filter, oil or plug your model takes. This page
explains how those guides are made, who is responsible for them, and how
much weight to put on them.
Who is responsible
Editorial responsibility for everything published here rests with
CarCompatibility.com, the operator of this site. Guides
carry the byline “CarCompatibility editorial team” rather than
individual names. If you need to raise something about a specific page —
an error, a correction, a right of reply — email
hello@carcompatibility.com and it will reach the person
who can change it.
Where the data comes from
- Manufacturer handbooks and owner literature.
- Original-equipment supplier catalogues, and the battery, bulb and
wiper fitment tools that parts manufacturers publish. - Regulatory and standards documents — UN ECE regulations, the DVSA
MOT inspection manual, SAE and ACEA specifications — for anything about
legality, grading or approval. - Retailer listings, used only as a lead to check against one of the
above. Never as the source of a specification.
How the pages are built
Our pages are produced with substantial help from software, including
AI tools, working from the sources above. That is how a small team
covers several hundred model-and-part combinations.
It also means the failure modes are software failure modes. A figure
that is right for one engine can end up applied to a whole model range;
a specification can look precise on the page when the underlying source
was vague. We would rather say that plainly than imply every line was
typed out by hand.
What “checked” means on a
page
- Where a page says “Key fitment figures checked against
manufacturer/OE data” with a date, the main specification on
that page was compared against manufacturer or OE-supplier data on that
date. - Where a page says the figures have not been individually
re-verified, they were compiled from catalogue data but not
checked entry by entry. - Neither statement is a guarantee. Specifications vary by engine,
trim, market, facelift and build date, and manufacturers change parts
without announcing it. Confirm the part against your registration, VIN
or handbook before you buy or fit it.
When we get it wrong
We correct it. An internal review in August 2026 found that a number
of battery pages had taken their specification from a single product
datasheet rather than from per-vehicle data. Those pages were re-sourced
from manufacturer and OE-supplier data; where we could not re-source
them, the page now says so instead of showing a figure we cannot stand
behind.
If you spot something wrong, email
hello@carcompatibility.com with the page address and
your make, model, year and engine, and we will re-check it against the
source data.
Brightness, warranty and
product claims
Where we quote a manufacturer’s performance figure — a headlight bulb
that gives “up to 150% more light”, for example — that is the
manufacturer’s own claim, and the comparison is against the minimum
legal standard for that bulb category rather than against an ordinary
bulb. Warranties and prices are set by the manufacturer or the retailer,
change without notice, and are not something we can verify for you.
How the site is funded
Advertising and affiliate commissions. As an Amazon Associate we earn
from qualifying purchases. This never decides which part we say fits
your car. See our Affiliate
Disclosure.
What this site is not
It is not a substitute for your vehicle handbook, for the
manufacturer’s own fitment lookup, or for a qualified mechanic. We are
not affiliated with, endorsed by or connected to any vehicle or parts
manufacturer or retailer. See our Disclaimer
and Terms of Use.