Comments by "afcgeo" (@afcgeo882) on "Car Confections" channel.

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  24. 100% incorrect and an old myth. Octane in fuel changes the timing pressure for the ignition of the fuel. Each engine ignites fuel at a precise moment, according to its calibration. Some engines have a higher compression ratio and some have a lower one, so the fuel needs to be ignited at different points. That is ALL that octane does for the engine. There are ZERO advantages of running a higher octane number fuel in your car than it is designed for. In fact, you are doing harm to your engine because higher octane fuel is designed to ignite at higher pressures than your cylinder ever achieves, so you're burning the fuel incompletely and you're burning out the cylinder components. Running a lower octane rating than required will create a knocking in your engine. Most European cars are NOT designed to require premium fuel. The issue is that in Europe, octane is measured differently than in North America, so the rating you see on the pump will not coincide. Premium, high performance engines require a higher octane rating because they want a higher compression for their fuel and are thus timed to ignite at a higher compression. Many modern cars have variable timing ignition systems, which means the vehicle will detect the type of fuel you have off the first few cylinder firings and the computer will adjust the ignition point to match. However, when you run on lower octane, you will have lower compression and thus, lower performance number. All current Volvos run high performance engines with turbo and often superchargers as well. They require high octane fuel because they are calibrated for high output performance.
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