Gas prices being what they currently are, many motorists are wondering just how useful filling up with premium fuel really is. This is normal. Other people are questioning the potentially harmful effects of low-octane gas. Show So, let’s try to address the issue described in this article’s title with the three following scenarios. First, in a regular car, premium fuel is only needed under specific conditions (intensive use for example), and has little to no impact on engine performance or efficiency. This is what various studies have revealed, including the one led by the American Automobile Association (AAA) a few years ago. If regular fuel is recommended, don’t waste your money on premium. But it’s a good idea to use premium occasionally because it contains more additives and detergents that can help your engine. Conversely, if premium fuel is required by the manufacturer (as shown on the fuel filler flap) in a luxury high performance car, or one equipped with a turbo, you have your answer. Using regular gas will not only affect the engine’s performance, it will also impact its long-term health and operation, because it wasn’t designed for this type of fuel.  Photo: William Clavey Now, what happens when a vehicle can use both? Take the various Mazda models equipped with the 2.5-litre turbocharged four-cylinder, for example. This engine loses a little bit of power (23 horsepower and 10 ft-lb) when fed with regular gas, but there’s no significant danger in doing so daily. However, remember this: when a premium fuel engine runs on regular fuel, there’s a risk of combustion of the fuel mix before the spark plug even lights up. This causes a phenomenon called knocking, which is likely to damage the engine. Although Mazda recommends using premium fuel, they don’t require it. Why? Because their engine doesn’t have a very high compression rate and boost pressure. In other words, this is not really a high-performance turbo engine. In everyday driving, there’s no problem using regular gas, but if you often drive up and down hills or tow, premium fuel will make the engine’s task easier. If you have any question regarding the fuel required for a particular vehicle model, consult the owner’s manual or one of the brand’s dealerships. Video: Regular or Premium Fuel?Join Date: Mar 2010 Posts: 540 Hey guys, I know we should be using 91 octane gas but I was just asking what happens if you run with 87? The main reason I'm asking is because right when I got the car I put in 87 for about a month before I realised I was supposed to be using 91... What kind of damage could it have caused and what should I do to try and reverse any of that damage? I use 91 now but I was just wondering if theres anything I should do to clean it out or something? Thanks a lot Join Date: Jun 2006 Location: San Diego Posts: 715 The ecu will retard timing and lower power for low octane gas. The worst that could have happened was your plugs may have fouled out, but if it drives okay, you're probably fine. Don't worry about it, just keep using 91. Join Date: Dec 2009 Location: USA Posts: 4,298 Lol one time the station was out of 91 or 93 so I had to use 87 to get me to the next station and My check engine light came on and car drove like pure hell Join Date: Mar 2010 Posts: 540 Yeah the car drives fine now. When I was using the 87 octane I noticed that the car sometimes had trouble turning over but ever since I swapped to 91 the car runs super smooth. My other question is that where I live the 3 types of gas are 87,89 and 91...Is 89 good enough or should I really use 91? Join Date: Jun 2006 Location: San Diego Posts: 715 use the highest octane possible. 93 would be the best (reasonably). Join Date: Jul 2007 Location: Denver, Colorado Posts: 1,950 You'd only save about $1.50 for 89 instead of 91, why even bother? Join Date: Feb 2010 Location: Redondo Beach, CA Posts: 90 Use whatever octane gas the cars engine is built for and the ECU is programmed for. The octane rating only dictates how hard the fuel is to ignite, it does not dictate the quality of the gas. 87 is easier to ignite than 89, which is easier to ignite than 91, etc. If you run higher octane than your cars engine and ECU are meant (what it's properly built and tuned for) to use, the engine will have trouble igniting the fuel: your fuel mileage will go down, you will lose power, and it will generally run worse (although it won't be greatly noticeable if the octane difference is small). If you run lower octane than your cars engine and ECU are meant to use, your engine may pre-ignite the fuel which can severely damage the engine. This happens when pressures inside the cylinder are high enough to ignite the fuel before the spark plug actually fires (ie high rpm or high boost [or both] situations). The moral of the story is run what the car is built for. Our cars are built for 91 (at least in California, it may be 93 in other states). Join Date: Jun 2006 Location: San Diego Posts: 715 we have pretty good knock sensors so detonation isn't a huge issue, but yeah, run what it was designed for.
Join Date: Nov 2009 Location: Saint Petersburg, FL Posts: 911 Thank you Mr. Education. Run 93 and you'll be happy. Join Date: Sep 2008 Posts: 14 i used 87 for my S4 and it ran fine and my brothers A4 was fine too What happens if I put the wrong gas in my Audi?In most cases, the vehicle will run fine, but you may experience less power and a decrease in gas mileage. In more serious cases, you may hear engine knocking or valve chatter because the fuel isn't burning right. These things could damage your engine and you should take it to your mechanic.
Will my car mess up if I put regular gas in it?Over time, using regular fuel against your car's requirements can damage your vehicle. Prolonged use can cause knocking of the engine, which can in turn void the warranty of your car; especially if the car's manual specifically warns against using regular grade fuel.
What happens if you accidentally put regular gas instead of premium?Putting Regular Fuel in a Car That Requires Premium
Using lower octane fuel in a vehicle that requires premium gas could cause some serious internal damage. You'll most likely notice the spark knock (a sort of high-pitched pinging or rattling noise).
Does Audi really need premium fuel?Audi vehicles are made to run on premium gasoline because of their direct-injection technology and turbocharged engines. Without using premium fuel, you can damage your Audi's engine and even cause severe damage if you don't fill up with regular gas when it's recommended.
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What happens if i put regular gas in my audi
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