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Answered 2012-09-24 20:12:30

Octane is a measurement of the combustion process. Most commonly you will see "85 87 91" octane ratings on your average gasoline pump, this of course indicates the amount of octane that, that specific product contains.

The only purpose of octane is to resist detonation. What this means is that a higher octane gasoline is actually more stable than a lower rated fuel. When any kind of fuel is subject to high pressure and high heat (just like you'll find on the compression stroke of an average automobile) it becomes unstable and in some cases will spontaneously combust without an ignition source, this is called "detonation" which will make your engine sound like it's "knocking". Vehicles requiring a high octane fuel most often have engines with higher compression ratios which of course cause higher heat and higher pressures. Most common vehicles only require an octane rating of 85, octane ratings of 87 and 91 won't make your car run any better.

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My advice is to use exactly what the manufacture recommends on any older car. Using 87 octane in an engine that requires 91 octane will cause pre-detonation (pinging) and will eventually cause engine damage on older vehicles. On newer vehicles where the manufacture says, premium fuel recommended you can use 87 octane fuel. The fuel management system will adjust for the lower octane fuel. You will have a slight loss of power but no other problems. On vehicles were the manufacture say's premium fuel required you must use premium or you will damage the engine over time.


High octane gasoline (petrol) only provides better fuel mileage in vehicles that require the high octane. In a normal engine running higher octane provides no benefit.


There is no better. If your car is designed to run on 87 octane then using 93 octane is a total waste of money. The higher octane will provide no more power, no better fuel economy, and is of no benefit to the engine whatsoever. In fact using a high octane fuel in an engine designed for 87 octane may actually cause hard starting. Use exactly the octane as recommended by the manufacturer of the vehicle. Saying that, if your car is designed to run on 93 octane then using 87 octane can be detrimental to the engine due to pre-detonation that will be caused by running the lower octane fuel. It depends on whether the manufacturer recommends the use of higher octane fuel or says it is mandatory. Most vehicles built in the last few years where 93 octane is recommended can run on 87 octane with a slight loss in power. The engine fuel management system will adjust for the lower octane and there will be no harm to the engine. The bottom line is to use exactly what the manufacture recommends.


Higher octane fuels are used for most luxury cars that run hotter to get more out of the engine. It is also used for older vehicles that cannot handle the gunk from lower octane fuels.Added: The "experts" say that it is a waste of money to use high-octane premium fuel in those engines whose manufacturers do not call for it.


Lexus vehicles run best on 93 octane or better. you'll probably get pinging below that, especially on hard acceleration.


you should use the medium rating octane(may vary depending on station)but usually 89 octane


You can use either octane range of 87 to 89. But Daimler-Chrysler recommends to use 89 octane for optimum performance.


Regular Unleaded 87 octane. The use of a higher octane is a waste of money and will provide no benefit whatsoever.Regular Unleaded 87 octane. The use of a higher octane is a waste of money and will provide no benefit whatsoever.


It shouldn't. Most production vehicles built from 1990 to date, have a "knock" sensor which accommodates different octane levels.


87 octane is fine, but it will not hurt if you want to use a different octane...



You need 91 Octane, which you can use 93 octane and 89 octane mix. which is Premium and Mid grade fuel.


No reason to use it. It does not increase power output. Mowers are designed to run on regular octane gas, and do not need higher octane numbers.


It is recommended to use 91+ octane. You can use 87 or 89 but you will have less mpg and horsepower. Only on vehicles that state it is required to use 91+ do you have to. But it is recommended you use 91+ though.


Octane renders? or Octane render. If Octane Render, it is a unbiased GPU ray tracer. You can create photo realistic 3D images within minutes.


Use "regular" gas - usually 87 octane.



87 octane should do fine. If you find it knocks a little then go to 89 octane. You can always use 91 octane, won't hurt, just in the pocket book.


87 Octane providing that it does not "ping" excessively - if it does use an 89 Octane


for any Volkswagen gas engine do not use anything lower than a 91 octane rating.


The 1994 Honda Prelude is best run with 91 octane fuel or higher. The vehicle is designed for use with high octane fuel.


Yes you can use 87 octane unleaded in a 1977 Yamaha XS750, that fuel was the good octane in those days


You should be fine with 91 octane. The higher the octane, the more you engine will like it, but 91 octane is enough for your ES 350.


my opinion-if it is designed for 87 use 89.


I would not use anything less than 89 Octane



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