Why is it dangerous to pour AI-98 and AI-100 high-octane gasoline into a car

The pursuit of savings on everything and everything is the engine of progress today. So, at domestic gas stations, the “hundredth” gasoline is increasingly appearing, which, according to the statements of marketers of fuel companies, guarantees increased power, low consumption and resistance to engine coking. However, in reality things are somewhat different. With details - the portal "AvtoVzglyad".

So, we already know that the manufacturer's recommendations for fuel should be followed unquestioningly. It is written on the tank "not lower than 95" - if you please, fork out for the ninety-fifth and forget about the column with the AI-92 index. But what will happen to the engine of a modern car if you regularly pour “weave” into it? This is “not lower than 95”, therefore, you can try to overpay for fuel, but save on consumption. Or not?

Add fuel to the fire and those whose soul requires speed. And what Russian does not like fast driving. Let's pour the AI-100 into the "swallow" and it will fly, like Gagarin, straight up! Alas, drivers will face problems that are not mentioned in the brochures. But it is not customary for us to read the instructions for using a car: in three out of four used cars they are untouched.

To find the answer to the question of "super high octane" gasoline, it is worth delving into the theory. The higher the octane number, the higher its resistance to compression, therefore, it will ignite at the moment when the candle gives a spark, and not when it is compressed in a cylinder under a pressure of twelve atmospheres at top dead center, ignited by a hot “tail” of a candle or other engine parts. If the engine is designed for AI-95, and AI-92 was poured into it, then the fuel will not ignite, but simply explode, destroying the pistons and cylinder walls. Regular conduct of such an experiment will lead to increased wear and an early failure of the power unit.

Gasoline AI-100, of course, will not allow this to happen. However, there is a downside to the issue: burning time. High-octane fuel burns more slowly and simply does not have time to burn out in time, burning not only the valves, but also all the rubber seals, of which there are a myriad of in any internal combustion engine. The engine temperature will always be above the engineer's limit, the cooling system will constantly run at its limit, and the valve cover gasket, cylinder head and others will simply leak out one day. We will politely keep silent about thin rubber gaskets on the nozzles. Of course, there will be no detonation, but the motor will have to be sorted out, replacing some of the parts along the way.

Filling in your used foreign car "weaving", you should not expect a monstrous increase in power or an enviable economy. Most likely, neither one nor the other in an arbitrarily small, tangible volume without instruments will occur. But all the seals and gaskets will “burn out” with a blue flame, the valves will burn out, and the cooling system will be tied into a knot. If AI-92 is written in the recommendations for the car in black on white or blue on red, pour the “second”. Written 95 - "fifth". AI-100 gasoline can only be used on highly accelerated engines, which today can only boast of the Nissan GT-R, Subaru WRX STI and "evil Germans" like the Audi RS6. All the rest - in line to the next column.