The Hidden Dangers of Low-Cost Fuel in Spain

The Hidden Costs of Cheap Fuel: What You Need to Know About Low-Cost Petrol Stations in Spain

Due to the high cost of living, many drivers across Spain have turned to low-cost petrol stations in the hope that they can save a few euros at the pump. On the surface, it does make sense, especially if you consider that the base fuel supplied to all stations in Spain, whether Repsol, Cepsa, or a discount chain like Ballenoil, comes from the same logistics company, Exolum. However, it’s what happens after delivery that really matters. What many drivers don’t realize is that it’s the fuel’s additive content that improves long-term vehicle performance, reliability, and even cost.

One example of the risks associated with low-cost fuel occurred in Alaquàs, near Valencia, in 2025. Over 50 vehicles suffered engine damage after refuelling at a low-cost Ballenoil petrol station. Most of the vehicles stalled shortly after they filled up with 95-octane fuel. Upon inspection, mechanics discovered that some of the fuel tanks contained up to 70% water. The contamination led to repair bills ranging from €600 to €1,200.

While Ballenoil accepted responsibility and blamed a technical fault that allowed water infiltration, the incident raised a vital question: Are low-cost petrol stations safe?

A Growing Number of Complaints on Facebook and Local Forums

Reports of fuel-related vehicle issues seem to be appearing more frequently in the Spanish news in recent months. Posts in Facebook groups and local expat forums often read: “I filled up with octane 98 at a low-cost petrol station and not long after the engine shut down. Has anybody else has issued like this?” or “My car is giving performance issues, do you think it could have something to do with low-cost fuel?”

There are many comments and posts like these among drivers in Spain. People often refer to unexplained breakdowns, engines that stall, and mechanics who find contaminated fuel. Each case may seem isolated, however the number of complaints could suggest a problem with quality control, and especially at unmanned low-cost stations where maintenance standards vary.

Low-cost fuel versus brands and premium fuel

Spain’s fuel system ensures that all stations receive the same base petrol or diesel. However, premium fuel brands like Repsol, BP, Cepsa, Shell, etc. enhance their fuels with proprietary additives that offer substantial benefits to your engine:

• Detergents keep fuel injectors and intake valves clean.
• Corrosion inhibitors prevent rust caused by condensation or moisture.
• Friction modifiers improve engine smoothness and improve fuel consumption.
• Combustion enhancers enable more efficient fuel burn, reducing deposits and emissions.

These additives help protect your engine, maintain performance, and improve fuel efficiency over time. In contrast, low-cost petrol stations mostly do not use additives or use minimal substitutes, leaving your engine more vulnerable to wear and reduced mileage.

Fuel Consumption Per Euro: Is Cheap Really Cheaper?

Many drivers believe that because the price per litre is lower at low-cost stations, they will then save money. The reality is that the fuel consumption per euro may not be as favourable as it seems. Without fuel additives:

• Combustion is less efficient
• Deposits build up faster in injectors and spark plugs
• and Fuel economy drops considerably over time

(It’s worthwhile doing your own test to check how far or how many kilometres €40 from a low-cost station will get you versus how far you can drive on €40 from a premium brand.)

You may even appear to save a little in the short term, but the long-term result could be higher maintenance costs and engine issues, especially in diesel and turbocharged vehicles.

Should You Avoid Low-Cost Petrol Stations in Spain?

Not always, but blind loyalty to the lowest price may not be the smartest decision either. If you drive a modern vehicle, cover long distances, or use sensitive engines, premium fuels with proper additives are the safer long-term choice.

At the very least, it may be a good idea to alternate between low-cost and premium brands. You should also be wary of unmanned stations without visible upkeep, poor pump conditions, and lack of maintenance.

Low-cost fuel may save you a little today, but it could cost you a lot more tomorrow. It’s best to consider the potential engine wear, repair risks, and your peace of mind.