Does the Type of Gas I Put in my Auto Matter?

There are no detergent benefits, and pricey gasoline usually doesn’t mean more longevity. It’s mostly just a marketing ploy. Check the owner’s manual. If premium is ever needed, it will tell you. If the requirement isn’t there, avoid premium and save yourself the money.

When auto engines aren’t created for premium gasoline, they will not ever benefit from the higher-octane fuel. It has to do with how the fuel is ignited. Premium gasoline ignites at a higher temperature, so it can handle higher compression without reigniting. It also has less heptanes, and that also helps with preventing the reignition at low temps. Even the government regulators agree – there’s no advantage for it in the average tank.

Even if the owner’s manual does list a need for premium fuel, chances are you don’t always have to use it. This is particularly true for automobiles built since 1996 because of technology that adjusts timing. With engines that are meant for premium gas, the low-temperature can mean better performance. The premium gas also prevents knocking or pinging sounds. However, if you aren’t racing or hauling heavy loads, the difference in engine performance is slight but the cost is far greater. The only exception is for engines that have knocking sounds when regular fuel is being used, even under standard driving conditions. For these vehicles, experiment or talk to one of our ACE-certified mechanics about using the right gas.

Can I Use Diesel?

Premium and regular can mix, but not with diesel. If you drive a diesel, filling the tank with regular unleaded will cause it to fail completely. Then, you’ll have to pay the high costs of flushing the system of gasoline. Diesel is a little grimier and much thicker than gasoline, and diesel vs. gas engines are different in many ways. Cars designed for diesel don’t include spark plugs. Instead, the fuel is injected directly and ignited by heat. With gasoline, air and fuel are combined first and then the spark plugs do their work.

Get in Touch with Christian Brothers Today

If you have questions about how to choose fuel or if you’re having any problems with your fuel system, give our trusted team in Centennial, CO a ring. We do maintenance, pre-pruchase checks and repairs.