Fuel additives are a R$ 800M annual market in Brazil — and a field full of exaggerated claims. Some additives genuinely protect engines. Others are marketing. The Petrol Group team analyzed the main categories and separated what science confirms from what is just a sales pitch.
The main categories of fuel additives
Detergent/dispersant additives — clean deposits from injectors, intake valves and combustion chambers. Most studied and strongest evidence base. Cetane improvers (diesel) — increase ignition quality, reduce cold-start smoke. Relevant for older engines or low-quality base fuel. Lubricity agents (critical for Ultra Low Sulfur Diesel, including S10) — low-sulfur diesel loses lubricity in the refining process. Lubricity additives prevent premature injection pump wear. Biocides — kill microorganisms that grow in diesel tanks. Essential for stations in humid climates. Corrosion inhibitors — protect metal fuel system components. More important in ethanol-blended fuels.
Do additives actually improve fuel economy?
Independent testing (Brazilian INMETRO 2024 data) shows 0-3% fuel economy improvement with premium additive packages in vehicles in good condition. For vehicles with accumulated deposits (80,000+ km without injector service), the first 3-5 fill-ups with high-detergent fuel show 3-6% improvement as deposits are removed. The improvement is real but modest — and diminishes once the engine is clean.
For the station owner: selling additives as a revenue stream
Bottled additives (200–500ml concentrates) offer 30-50% retail margin and require no refrigeration or special storage. They are natural cross-sell products at the convenience store counter or through trained attendants: “Your car has over 80,000 km? This injector cleaner works in 2 fill-ups.” A trained attendant recommending additives increases transaction value by R$ 15-40. See how gas station marketing strategies can incorporate additive upsell.
S10 diesel: why lubricity additives matter more than ever
The shift to ultra-low sulfur diesel (S10) created an unintended consequence: the refining process that removes sulfur also removes the natural lubricity compounds in conventional diesel. S10 diesel has 40-60% lower lubricity than older S500 diesel. Injection pump manufacturers specify minimum lubricity requirements — and in some S10 supplies that don’t meet specs, lubricity additives aren’t optional, they’re protective maintenance.
FAQ: diesel additives
Can I mix diesel additives with biodiesel blends?
Most quality diesel additives are formulated to be compatible with B10-B15 biodiesel blends. Check the additive label — avoid products that don’t specify biodiesel compatibility.
How much lubricity additive does S10 diesel need?
Typical treat rate is 50-200 ppm (parts per million). Follow manufacturer dosing instructions — more is not better with lubricity additives.
Read also: gasoline storage at gas stations — which covers how fuel quality is affected by storage conditions, complementing additive strategy.
