Many drivers, prompted by the dynamic prices on the market, may start to keep fuel stocks in the garage. At first glance, gasoline and diesel seem like products with an almost eternal shelf life, as long as they are in a closed container. However, chemistry says otherwise. Fuel is a complex mixture of hydrocarbons and additives that begins to degrade the moment it leaves the hermetic system of the oil base.
Invisible processes: Why does fuel “age“?
When we leave gasoline in a metal or plastic container for more than a few months, oxidation processes begin. The easily volatile fractions that are responsible for easy engine starting are gradually lost. The result is a change in the chemical composition, a decrease in octane number and the appearance of resinous deposits, which can later stick to injectors and fuel filters.
With diesel, the situation is even more delicate. The main enemy here is condensation. Temperature differences lead to the formation of microscopic water droplets on the walls of the container. Since water is heavier than diesel, it settles to the bottom, creating an ideal environment for the development of specific microorganisms and bacteria. These bio-processes form a thick mucus that is capable of literally paralyzing the fuel system of a modern car.
The risks of using “stale“ fuel
Using fuel that has been sitting for half a year or a year without proper treatment rarely goes unnoticed for the car. The most common symptoms are:
Irregular engine idling.
Loss of power during acceleration.
Difficult starting, especially with a cold engine.
Increased fuel consumption due to poor fuel atomization in the cylinder.
How to store supplies correctly?
To preserve the properties of the energy resource for as long as possible, you need to follow a few “golden“ rules:
Choice of container: Use only certified containers with tight seals. Metal tubes are preferable to plastic ones, as they limit the penetration of light and static electricity.
Environment: A cool, dark place is a must. Sudden temperature changes are the main catalyst for the formation of condensation.
Stabilization: If you plan to store for more than 6 months, the use of specialized stabilizing additives is practically mandatory. These preparations “lock“ the chemical formula, prevent oxidation and stop the development of microorganisms in the diesel.
The problem that lies in the tank itself
It is important to remember that storage does not only occur in cans. Hybrid cars, cars with gas systems or seasonal machines (such as convertibles and motorcycles) often stay for months with the same gasoline in the tank. There, the conditions are even worse, since the fuel is in constant contact with air and metal surfaces.
In such cases, the addition of preventive cleaning and protective components is highly recommended. Not only do they keep the fuel fresh, they also protect the delicate components of the system from corrosion while the vehicle is not in use.
Ultimately, keeping a reserve may be a sensible strategy for some, but only if the chemistry of the process is understood. Proper care today saves expensive repairs at the garage tomorrow.