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Why Fuel Names Matter
Putting the wrong fuel in your car is expensive and dangerous. Diesel in a petrol engine (or vice versa) can cause serious damage — repairs often run into thousands. Yet fuel has different names in every country: petrol, gasoline, benzin, nafta, gasoil, mazout. Pumps are colour-coded differently. Octane ratings vary. This guide helps you avoid costly mistakes.
Petrol / Gasoline — Name Mapping
Petrol (or gasoline in North America) is spark-ignition fuel for standard cars. Here’s what to look for at the pump:
| Region | Common Names | What to Look For |
|---|---|---|
| UK, Ireland, Australia, South Africa | Petrol, Unleaded | Green pumps (usually); “Unleaded” or “Petrol” |
| USA, Canada | Gasoline, Gas | ”Regular,” “Midgrade,” “Premium”; green or black handles |
| Germany, Austria, Switzerland | Benzin, Super | ”Super” (95), “Super Plus” (98); sometimes “Benzin” |
| France, Belgium | Essence, Sans plomb | ”Sans plomb 95” or “SP95”; “Sans plomb 98” or “SP98” |
| Spain, Portugal | Gasolina, Gasolina sin plomo | ”Sin plomo 95” or “Gasolina 95” |
| Italy | Benzina | ”Benzina” or “Senza piombo” (unleaded) |
| Netherlands | Benzine | ”Euro 95” or “Super 98” |
| Eastern Europe | Benzin, Nafta (some countries) | “Benzin” or “95”/“98” |
| Japan | ガソリン (gasorin) | “レギュラー” (regular) or “ハイオク” (high octane) |
| Latin America | Gasolina, Nafta (Argentina) | “Gasolina” or “Nafta”; “Premium” or “Super” |
| Middle East | Petrol, Gasoline | ”Super” or “Premium”; often in English |
Key: “Unleaded” = petrol. “Sans plomb,” “sin plomo,” “senza piombo” = unleaded. If you see “blei” or “plomb” or “plomo” alone, that’s leaded — avoid (rare now).
Pump colours: There is no global standard. Green often means petrol in the UK and diesel in some European countries. Yellow is sometimes diesel. Always read the label — never rely on colour alone.
Diesel — Name Mapping
Diesel (compression-ignition) is for diesel engines. Never put diesel in a petrol car, or petrol in a diesel car.
| Region | Common Names | What to Look For |
|---|---|---|
| UK, Ireland | Diesel, Derv | Black pumps; “Diesel” |
| USA, Canada | Diesel | Black or green (varies!); “Diesel” |
| Germany, Austria, Switzerland | Diesel, Gasöl | ”Diesel”; yellow pumps common |
| France | Gazole, Diesel | ”Gazole” or “Diesel” |
| Spain, Portugal | Gasóleo, Gasoleo | ”Gasóleo” or “Diesel” |
| Italy | Gasolio, Diesel | ”Gasolio” or “Diesel” |
| Netherlands | Diesel | ”Diesel” |
| Eastern Europe | Diesel, Mazout (heating; don’t use) | “Diesel”; avoid “Mazout” (heating oil) |
| Japan | 軽油 (keiyu) | “軽油” or “Diesel” |
| Latin America | Diesel, Gasoil | ”Diesel” or “Gasoil” |
Mazout / heating oil: In some countries, “mazout” or similar refers to heating oil, not road diesel. Don’t use it in your car — it can damage the engine and is illegal for road use.
Biodiesel: In some regions, diesel pumps offer B7, B10, or higher biodiesel blends. Most modern diesel cars accept up to B7; check your manual. B100 (pure biodiesel) is rare at retail pumps and not suitable for all engines.
Octane Ratings — Don’t Assume
Octane ratings differ by region. A “95” in Europe is roughly equivalent to “91” in the USA (different measurement methods: RON vs. (R+M)/2). Most modern cars tolerate a range, but high-performance or older cars may need specific grades.
Europe: 95 RON is standard (“Euro 95,” “Super 95”). 98 RON is premium. Most rental cars run fine on 95.
USA: 87 (regular), 89 (midgrade), 91–93 (premium). Check your rental car’s fuel door or manual.
Japan: Regular (89 RON equivalent) and High Octane (96+). Rental cars usually take Regular unless specified.
When in doubt: Use the higher grade. Using 98 in a car that needs 95 won’t harm it (just costs more). Using 95 in a car that requires 98 can cause knocking — check the manual or fuel cap.
What to Do If You Use the Wrong Fuel
If you put the wrong fuel in your tank:
Before starting the engine: Do not turn the key. Do not start the car. Have the tank drained by a professional (recovery service, garage, or fuel station with drain capability). Cost: typically €100–300. Once drained and refilled correctly, you can usually drive away with no lasting damage.
After starting the engine: Stop as soon as you notice (spluttering, loss of power, strange noises). Do not drive further. Call for recovery. The fuel system may need flushing; injectors or other components may be damaged. Repairs can run into thousands. Inform your rental company immediately if it’s a rental — they may have specific procedures.
Prevention is everything: Double-check the pump label every time. When tired or in a hurry, mistakes happen — slow down and verify.
Filling Up Mistakes to Avoid
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Diesel in petrol (or vice versa): The most costly error. If you realise before starting the engine, do not start. Have the tank drained. If you’ve already driven, stop immediately — damage can escalate quickly.
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Wrong pump at self-service: Pumps can have multiple nozzles. Diesel nozzles are often larger and may not fit petrol filler necks (a safety feature) — but don’t rely on it. Always read the label on the pump and the fuel grade.
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AdBlue confusion: Some diesel cars have a separate AdBlue (urea) tank for emissions. It’s usually a blue cap, often near the fuel cap. Never put AdBlue in the fuel tank or fuel in the AdBlue tank. Labels should be clear — double-check.
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LPG/CNG mix-up: See below.
LPG and CNG — Alternative Fuels
LPG (Liquefied Petroleum Gas): Propane/butane mix. Common in some European countries (Netherlands, Poland, Italy), Australia, and parts of Asia. Cars may be dual-fuel (petrol + LPG) or LPG-only. Pumps are often marked “LPG,” “GPL,” “Autogas,” or “LPG Autogas.” Never put LPG in a petrol or diesel tank — it requires a different fuel system.
CNG (Compressed Natural Gas): Less common at retail pumps. Used in some fleet vehicles and parts of Asia/ South America. Different nozzle and tank — not interchangeable with petrol, diesel, or LPG.
If your rental is LPG or CNG, the company will explain. Most rentals are petrol or diesel.
Payment Methods at Gas Stations
Pay at pump: Common in USA, UK, and increasingly elsewhere. Card or contactless. Some pumps require a ZIP/postal code for verification — non-US cards can be tricky; pay inside if it fails.
Pay inside first: In some countries, you pay before fuelling. The attendant may ask how much you want, or you pay after (leave a card or pay cash).
Pre-authorisation: Your card may be held for a large amount (e.g., €150) and the actual charge adjusted later. Ensure you have sufficient limit.
Cash only: Rural or older stations may not take cards. Keep local currency handy.
Unmanned stations: Some stations are card-only with no attendant, especially at night. Have a chip-and-PIN card; contactless may not work for high amounts.
For toll and fuel costs on European trips, see our toll roads guide and European driving guide.
Quick Reference: Fuel Cap Symbols
Many cars have symbols on the fuel cap or in the manual:
- Unleaded / Petrol: Often a petrol pump icon; “95” or “98”; “Unleaded”
- Diesel: Diesel pump icon; “Diesel”; sometimes a “D”
- AdBlue: Blue cap; “AdBlue” or “UREA”
When picking up a rental, ask: “Which fuel does this car take?” and note it. Take a photo of the fuel cap if helpful. A moment of clarity at pickup saves a world of trouble at the pump.
Full-service vs. self-service: In some countries (e.g., parts of the USA, Mexico, full-service stations in Japan), attendants pump fuel for you. Tell them the fuel type and amount. In others, you pump yourself. When in doubt, confirm before inserting the nozzle.
Fuel capacity: Rental cars often have different tank sizes. A “full tank” return policy means refilling to the same level as pickup. Note the fuel gauge at collection; returning with less can incur expensive per-litre charges.
Premium vs. regular: If your car requires premium (98 RON / 91+ octane) and you’re in a region where only 95 is available, a tank or two usually won’t cause immediate harm in modern cars with knock sensors. For older or high-performance engines, plan your route to ensure premium is available. In remote areas, fuel quality and availability can vary — fill up when you can.