Octane is used to reduce pre detonation in high compression engines. The rating tells the driver which fuel to purchase and use in their vehicle as recommended by the manufacture of the vehicle.
Talk2DIY Automotive - 1986 Octane Ratings and Electrical was released on: USA: 16 September 2003
Lead was added to gasoline to inexpensively increase octane ratings and to also help reduce engine knocking.Increasing octane and reduce engine knocking are exactly the same thing, as the test method to measure octane of a fuel is to see when a standard engine begins knocking. The higher compression ratio the standard test engine can be operated at without knocking, the higher the octane of the fuel being tested.
High Octane Detonate - 2005 V is rated/received certificates of: Australia:M
High Octane 3 - 2002 V is rated/received certificates of: New Zealand:M
High Octane Overboost - 2004 V is rated/received certificates of: New Zealand:PG
High Octane 4 - 2003 V is rated/received certificates of: New Zealand:M
High Octane 2 - 2001 I V is rated/received certificates of: New Zealand:M
A 3vze engine will take anywhere from regular 87 octane, up to 100 octane race gas. However what is your purpose to using higher or lower octane, Using regular, plus, or premium will work well. however higher mile engines would prefer 91 octane!
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.
The three most common octane ratings at gas stations are typically 87, 89, and 93. The 87 octane is considered regular unleaded fuel, while 89 is often referred to as mid-grade. The 93 octane is labeled as premium fuel, designed for high-performance vehicles that require higher compression ratios for optimal engine performance. Some stations may also offer 91 octane as an alternative to 93.
It's not that simple. To keep things simple, though - use fuel with the octane rating that your car's instruction manual says you should.
The measure of antiknock properties in a fuel is typically expressed using the octane rating system. Higher octane ratings indicate better antiknock properties, meaning the fuel is less likely to cause knocking or pre-ignition in an engine.