Cars that need super unleaded (premium, higher octane like 98 RON) are typically high-performance, luxury vehicles, or those with turbochargers/superchargers, especially European models, to prevent engine knocking and maximize power; check your owner's manual or fuel cap for the specific requirement (often labeled "Premium Only") to avoid damage and ensure performance, as lower octane can reduce power.
High-Performance Cars: If you're driving a high-performance or luxury car, super unleaded is likely the best choice. It helps ensure your engine runs smoothly and efficiently. For example, if you're interested in special car leasing offers for sports cars, check if the model recommends super unleaded.
If you put 91 octane fuel in a car that requires 95 (or higher), you risk engine knocking (pinging), which can cause power loss, poor acceleration, reduced fuel economy, and, if done long-term or under heavy load, potential engine damage, as the lower octane fuel ignites too early under compression, but modern cars with knock sensors can often adjust timing to prevent immediate harm, making a single mistake less critical than continuous use.
Yes you can. Most cars from the last 20 years will be happy with either standard unleaded or super unleaded fuel, and it's not a problem to mix them.
Even if your car is cleared to run on the new E10 fuel, you may choose to run it on super-unleaded anyway. Super-unleaded should prove slightly more economical, so you'll be able to get more miles out of a tank of fuel, and some are said to clean and maintain the internals of your engine.
You'll also be pleased to hear that all fuels contain some sort of cleaning agent as it's required by law. if fuels didn't contain this all of our engines would be clogged up – some mechanics do suggest using premium fuel once or twice on older engines to keep them clean.
There's nothing wrong with mixing premium and regular gas in the same tank. In fact, this is how midgrade gas is formulated at the station. Rather than drawing from a separate storage tank for each octane rating, gas pumps actively mix high-octane fuel with lower-octane fuel to create midgrade gas.
Engine computers can usually adjust their timing to account for the increased octane levels, so if you put premium gas in a regular car, you probably won't notice anything. However, some engines are not designed to burn higher-octane fuel, and you may see a reduction in performance and fuel economy.
Selecting a grade of gasoline simply because it has a higher octane rating might not be the best choice for your car or your budget. While some vehicles can benefit from premium gas, most drivers can save money at the pump by using regular unleaded in their cars without sacrificing performance.
Premium fuel, which is also often referred to as 'super-leaded petrol' or 'high-performance diesel,' contains more cetane or octane than other fuels. The higher levels of cetane or octane hydrocarbons in fuel, the more premium and expensive it will be.
What cars use 91 octane?
Will using 91 instead of 95 or 98 damage my engine? "If your vehicle is designed to run on 91 octane, there is no risk of damage.
Premium Unleaded (95 RON) Super Unleaded (97 / 98 RON)
Is E10 petrol as good as e5? As we mentioned earlier, E10 petrol has been introduced for environmental reasons – but how does it compare performance-wise to E5 petrol. Generally, most drivers won't see much of an impact, and could in fact save money in the long run as E10 is cheaper.
Power petrol is more fuel efficient than regular petrol. As a result, it improves fuel combustion and boosts fuel economy. Power petrol removes deposits from intake valves and fuel injectors in engines. Power petrol manages and enhances the vehicle's Octane Requirement Increase (ORI).
Premium gasoline contains a higher number of detergents and additives than regular gasoline. This can help to keep your engine clean and free of deposits. These additives can help to remove deposits that may have built up in your engine over time and prevent new deposits from forming.
Petrol shelf life: Unleaded petrol typically lasts around 6 months when stored properly. In a vehicle, however, it can start to degrade within about 3–6 months, especially if exposed to temperature swings. Diesel shelf life: Diesel typically lasts longer, often lasting up to 12 months under the right conditions.
⛽ Non-Ethanol Gasoline
Non-ethanol fuel burns cleaner in certain engines, stores longer, and reduces the risk of damage to equipment not designed for ethanol-blended fuel.
If you want to use fuel with a higher octane than recommended, there's likely to be no issues yet no clear benefits either. Alternatively, if you're using a lower octane than is recommended, there's an increased risk of damaging your car in the long term.
Generally, you can expect your car's manufacturer to recommend you to change the fuel filters once every 20,000 to 150,000 miles. Since this is a wide range, you'll have to look at your owner's manual for the most accurate fuel filter replacement intervals for your vehicle's make and model.
General Motors recommends use of Unleaded 88 beginning with its 2012 and newer model year vehicles and Ford recommends Unleaded 88 for its 2013 and newer vehicles. Unleaded 88 is also approved for use by Volkswagen, Audi, Toyota, Land Rover, Porsche, Jaguar, and certain models of Mercedes-Benz and Lexus.
Symptoms of Using the Wrong Fuel
✅ If your car is designed for 91 RON fuel: You can safely mix 91, 95, or 98 without any issues. 🚫 If your car requires a minimum of 95 RON: You should NOT use 91 RON, even in a mix.
In terms of all the cleaners and additives, there is no difference between premium and regular. Premium has a high octane rating , which will prevent predetonation on higher compression ratio vehicles. If your car is designed to run regular, there is ZERO benefit to putting premium in it.