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Old 05 Mar 2011, 06:01 pm
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Default I have heard that using 91 octane on my 2006 4 cylinder 2.4 engine will do damage

because '' read below''? That?s what premium fuel does, it burns hot under high compression. In a normal engine, premium fuel does not burn completely, resulting in excess carbon build-up and carbon fouling of the spark plugs resulting in more tune ups and less efficient engine.

I have been putting super in my engine now for over 15 000 kms .
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Old 05 Mar 2011, 06:16 pm
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The short answer, all gas is the same. 93 compared to 87.... the difference is 93 is used for high compression motors like engines with turbos. 87 is for lower compression hence, no turbo. 93 is actually a cleaner gas depending how you look at it. But for any level gas to leave more carbon build up than others..... I doubt it. I been using 93 on my crotch rocket that takes 87 since i bought it brand new. 87000 miles later its still running clean and strong.
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Old 05 Mar 2011, 06:31 pm
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I have driven over hundreds of cars and all i put is Premium 93 or 92 (depending on the gas station). Premium is the best. Thats why they call it premium. You will feel a diffrence in the way your car drives. i believe its bad to get an engine driving on a particular type of gas and then change it to a diffrent type. Premium will always do better. Its not more expensive for nothing
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Old 05 Mar 2011, 06:46 pm
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The explanation is confused. The difference in gasoline grades today (it wasn't always so) is simply octane rating. High octane fuel does not burn hotter or slower than low octane fuel, it just is more resistant to detonation.

Detonation occurs when lighter hydrocarbons in the fuel conspire to ignite by the pressure front rather than the flame front. This is the same effect that ignites a diesel engine, but in a gasoline engine combustion chamber it is demonic. In essence, it changes the ignition from a low order explosion to a high order explosion. As the pressure front moves from the spark plug at the speed of sound it triggers ignition, creating a powerful shock that hits the piston and valves. The last engine I rebuilt had broken compression rings in every cylinder from detonation (it was from a 1970 Volvo 145 - no knock sensor in those days).

When detonation does not occur octane makes no difference whatsoever.
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Old 05 Mar 2011, 07:01 pm
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Only michael is right. The others are wrong. Turbo cars have lower compression, hence the turbo. But they do require premium fuel.

A car that doesn't call for premium fuel, won't benifit from premimum fuel. If it says regular, use regular. If it says premium, use premium.

If you've been using premium, and it doesn't need it, there isn't damage, just a waste of money. Use what the owners manual calls for.
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Old 05 Mar 2011, 07:16 pm
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cj and michael are 100% correct.

you cant really go too high in octane (atleast from whats available at the pumps) but its dangerous when you go too low. the higher the octane the more heat is needed to cause the air/fuel mixture to combust, so higher octane gas exists for cars whose compression of the air/fuel mixture would cause it to combust before its set off by the spark plug.

what you're talking about is burning rich, which is where the air:fuel ratio is not correct and the gas does not burn properly. no car has the air:fuel ratio set perfectly since tehres so many factors that can influence it, most sit around 13:1 or 12:1 when 14.7:1 is the perfect burn. its better to burn rich (too much fuel) then burn lean (too much air).

all that you're doing by using super is wasting money
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