A quiet concern is spreading among drivers as E20 fuel becomes more common at petrol stations. If you’ve noticed your car feeling less responsive or your fuel gauge dropping faster than it used to, you’re not alone. Many owners of vehicles built before 2023 are reporting these very issues, and the culprit is often the new fuel in their tanks.
While newer cars are designed to handle it, E20 fuel can pose a genuine risk to older engines. The good news is that there’s a straightforward and effective way to fight back and protect your investment.
Understanding the E20 Challenge for Older Vehicles
First, let’s be clear about what E20 is: a blend of 20% ethanol with 80% petrol. Ethanol is a biofuel, and while it’s great for reducing emissions, its chemical properties don’t always agree with the components in older cars and motorcycles.
The problems arise because ethanol is hygroscopic, meaning it naturally absorbs moisture from the air. This single characteristic sets off a chain reaction of potential issues:
- Corrosion and Rust: The absorbed moisture can lead to rust forming inside your fuel tank and other metal components, which can then flake off and travel through the system.
- Fuel System Damage: Ethanol can be harsh on rubber and plastic parts, causing fuel lines and seals to become brittle and crack prematurely.
- Gumming and Blockages: As fuel degrades, it can form sticky residues that clog vital parts like fuel injectors and pumps, disrupting the precise fuel flow your engine needs.
- Reduced Fuel Economy: Ethanol contains less energy than pure petrol. This lower energy density directly translates to fewer kilometres per litre, meaning you’re filling up more often.
- Risk of Hydrolock: In severe cases, if enough water is absorbed and separates from the petrol, it can be sucked into the engine cylinders. Since liquid doesn’t compress, this can cause catastrophic engine damage.
Left unchecked, these factors can lead to sluggish performance, expensive repairs, and a shortened engine life.
Your Engine’s Best Defence
So, what can you do if your car isn’t E20-compliant? The most reliable solution endorsed by automotive experts is the regular use of a quality fuel additive. Think of these additives as a concentrated protective supplement for your fuel system.
When you add one of these solutions to your tank during a fill-up, it works systematically to counteract the effects of E20. A good fuel additive performs several critical functions:
- It coats internal components with a protective layer to prevent rust and corrosion.
- It actively cleans and dissolves carbon deposits and gum from injectors and intake valves.
- It helps stabilize the fuel, slowing its degradation.
- By keeping the system clean, it ensures optimal combustion, restoring power and improving overall engine longevity.
For the best results, your first step should always be to check your vehicle’s owner’s manual. Many manufacturers offer their own branded additives, which are tailor-made for their engines. If one isn’t available, choose a reputable, well-known brand from the automotive aisle. This is particularly crucial for vehicles driven infrequently or those living in humid coastal areas, where moisture absorption is a greater threat.
By making a quality fuel additive a regular part of your maintenance routine, you’re not just solving a problem—you’re taking a proactive step to preserve your car’s health, performance, and value for years to come.
