Dec 1, 2008

Can you put 91 octane in any car?

Can you put 91 octane in any car? The answer is NO. Most car especially those new model uses high octane gasoline.  To make sure what is the recommended octane for your car gasoline fuel, look at the user manual it always indicates what type of fuel to be used for your car.

What happen if you use 91 octane on car with recommended fuel of 95 octane or above? 
Engine pinging is one of the problem that will encounter if you use 91 octane on the car that requires high octane rating. Pinging sound will occur while driving on flat roads or while driving uphill. Pinging sound is categorized as an engine related fault, and one of the reason that triggers pinging sound is by using a low octane gasoline fuel like the 91 octane.
Gas with low gasoline octane or low grade gasoline or mostly those gasoline with a gasoline octane rating of 91 or below can cause engine pinging sound, gasoline with low gasoline octane or low grade gasoline burns easily because of being too combustible. 

When a gas burns easily, under certain conditions it will self ignite before the piston reaches the top of the combustion chamber thus pre-ignition occurs, this will cause the engine to create pinging sound.

So, to avoid such problems, always use a gasoline with higher gasoline octane rating, you can see the gasoline octane rating on the front of the gas pump when filling your car on filling station.

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Usually gasoline with high gasoline octane are those with 93 or above rating (some gasoline station do not have 93 octane) and are usually called super gasoline, the available gasoline in the market now is 91 octane, 95 octane and 100 octane.

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