Selecting the Right Octane

 

What are octane ratings?
Octane ratings measure a gasoline's ability to resist engine knock — a rattling or pinging sound that results from premature ignition of the compressed fuel-air mixture in one or more cylinders. 

CountryMark offers gasoline in five octane grades: regular (87 octane), mid-grade (88, 89 and 90 octane), and premium (93 octane).

  


             

   

What's the right octane level for your car?
Check your owner's manual. Regular octane is recommended for most cars. However, some cars with high compression engines, like sports cars and certain luxury cars, need mid-grade or premium gasoline to prevent knocking. 

How can you tell if you're using the right octane level? Listen to your car's engine. If it doesn't knock when you use the recommended octane, you're using the right grade of gasoline.

Will higher octane gasoline clean your engine better?
No, as a rule, high octane gasoline doesn’t outperform regular octane in preventing engine deposits from forming, in removing them, or in cleaning your car's engine. The best advice for avoiding and/or eliminating engine deposits is burning a TOP TIER gasoline

Should you ever switch to a higher octane gasoline?
A few car engines may knock or ping even if you use the recommended octane. If this happens, try switching to the next highest octane grade. In many cases, switching to the mid-grade or premium-grade gasoline will eliminate the knock. If the knocking or pinging continues after one or two fill-ups, you may need a tune-up or some other repair. 

A car's octane requirements can also change as mileage increases. As mileage accumulates, carbon deposits can form in the combustion chamber, which can increase the incidence of engine knock. Deposits raise the compression ratio and can get very hot, thus serving as a source of ignition.

Will knocking harm my engine?
Occasional light knocking or pinging won't harm your engine, and doesn't mean you need a higher octane. But a heavy or persistent knock can lead to loss of power, and overheating of engine parts such as valves, pistons and spark plugs. In severe cases, piston heads can crack or burn, and engine life can be shortened.

Where can I purchase CountryMark PLUS gasoline? 
Visit our growing list of CountryMark retail fuel stations, or contact a CountryMark branded dealer to discuss fuel delivery options.

Unleaded 88 now available at CountryMark terminals
CountryMark, a farmer-owned cooperative, recently added Unleaded 88, a 15 percent ethanol blend to its PLUS gasoline product line-up. The new, higher octane gasoline fuel will be available for purchase at CountryMark fuel terminal locations in Jolietville, Mt. Vernon, Peru and Switz City, Indiana.
 
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A message from CountryMark President and CEO Matt Smorch regarding COVID-19 (coronavirus).
 
CountryMark CEO Retires After Lifetime Career in Oil Business
After 17 years as CountryMark's chief executive officer and president, Charlie Smith will retire from the company this December. "Our employees are what makes this company great, and I have been honored to serve them since 2003," said Smith.
 
Smorch will lead CountryMark as next CEO
The CountryMark Board of Directors recently named Matt Smorch as the new president and chief executive officer following the retirement of Charlie Smith effective January 1, 2020.
 
Small Refiner Exemption Protects Jobs without Destruction to Renewable Fuel Demand
As a farmer-owned cooperative, CountryMark serves as a strong advocate and state leader in the marketing of renewable fuels including ethanol and biodiesel blends. Due to disproportionate economic hardship, CountryMark applied for an exemption under the Environmental Protection Agency's Renewable Fuels Standard (RFS) for 2018 and has notified the EPA of its intent to sue because the EPA has not issued its determination within the timeframe required by law.
 
 

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