Does the Type of Gasoline I Put in my Engine Mean Much?

It might be time to reconsider some unfortunate myths about premium vs. regular fuel. Fortunately, you will almost never get benefit from anything more expensive than regular gas.

Premium gasoline isn’t more rich with engine cleaners and almost never affects performance. It’s a false idea spread by the oil industry. Read the owner’s manual. If premium fuel isn’t a listed requirement, you don’t need it. If the requirement isn’t there, avoid premium and save money.

When auto engines aren’t made for premium fuel, they never need the higher-octane fuel. It has to do with engine combustion. Premium gas ignites at a higher temperature, so it can withstand more compression without reigniting. It also has lower levels of 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 ask for premium fuel, you may not always want it. Especially if you drive a 1996 or later because of technology that adjusts timing. With higher-performance engines that are meant for premium gas, the lower ignition rate can mean better performance. The expensive fuel also prevents pinging or knocking noises. However, unless you’re pushing your engine to the max, the difference in engine performance is minor but the cost is far greater. If your engine knocks with normal use, it’s a different story. For these vehicles, do a little more research or ask our ACE-certified auto experts about using the right gas.

Can I Try Using Diesel?

While it’s not usually smart to use premium gas over regular unleaded never try diesel in a gas engine. You could stall the engine and need to be towed. You will have to deal with the costs for a system flush. Diesel is a little grimier and much thicker than gasoline, and diesel vs. gas engines are different in many ways. These don’t use spark plugs. Instead, the fuel is injected directly and ignited by heat. With regular gas, fuel and air are mixed first and then the spark plugs do their work.

Call Christian Brothers in Collierville, TN Anytime

If you have uncertainties about how to choose fuel or if you’re having any problems with your fuel system, give our trusted auto experts in Collierville, TN a call. We can help with everything from inspecting automobiles you’re considering purchasing to tune-ups and repairs.