semiatic
B7

B7 in a square

Diesel containing up to 7% biodiesel (FAME, fatty acid methyl ester). On a vehicle, a B7 square means it can use diesel with up to 7% biodiesel.

What to do

A square means diesel. If the label by your filler flap or in your manual is a square with B7, fill from a nozzle marked B7. If your car's label is a circle (petrol), do not use a square-labelled pump.

What it looks like
The letters B7 in bold inside a square, black on white.
Where you find it
On the nozzle and on the dispenser at the filling station; next to the fuel filler cap or flap of vehicles built after the labels became compulsory (12 October 2018 in the EU, 1 April 2020 in the UK); in the owner's manual; at car dealers.
Kind
diesel-type fuel
Set by
EN 16942:2016+A1:2021, identifier for diesel-type fuels (a square), required by Directive 2014/94/EU Article 7; in the UK, SI 2019/421 Schedule 1, Part 2

Can my car use it?

“The information inside the shape indicates the maximum biofuel content in the fuel that is recommended for use by the vehicle that is equipped with the new label.”

“Vehicle manufacturers do not recommend fitting the labels to older vehicles. Please contact your local dealer if you need advice on which fuel is recommended for use in your vehicle.”

Check your vehicle's manual or the label inside the filler flap. We do not say which makes or models can use this fuel.

Official guidance:

In detail

  • The B stands for biodiesel. The operators' guide explains it as bio-diesel in the form of fatty acid methyl ester (FAME), up to the percentage shown; UK law defines 'BX' as X being 'the maximum FAME content in volume percentage'.
  • The square must be at least 13 mm by 13 mm on a nozzle, a vehicle or in a manual, and at least 30 mm by 30 mm on the dispenser (SI 2019/421, Schedule 1, Part 2).
  • The makers' consumer leaflet points out that a petrol car's filler neck is deliberately smaller than a diesel nozzle, but that it is still possible to put petrol into a diesel vehicle by mistake. The square is there to help you notice before you do.
  • Older cars have no label: the EU rule covers only vehicles first placed on the market or registered from 12 October 2018, and vehicle makers do not recommend fitting labels to older vehicles.

What it does not mean

B7 is not a brand, a premium grade or a cetane number, and it does not mean the diesel is exactly 7% biodiesel: 7 is the maximum.

Labels that go with it

B10B10 in a squareDiesel containing up to 10% biodiesel (FAME). On a vehicle, a B10…XTLXTL in a squareParaffinic diesel fuel: diesel made by synthesis or hydrotreatment…

Sources

Each document was fetched and read on the date shown; the clause or section is the one that sets or explains this label.