Quote Originally Posted by ekay1 View Post
but wouldnt 91 decrease the performance? like against ulitmate and v-power. Plus, i think that its better on the engine if you fill up with better petrol. And btw, does anyone know if its necessary to replace the engine oil on the first 5000km run in a new car?
depends on what the engines made to be run on, if the engine isn't designed to run on high octacne then it won't be able to take advantage of the benefits...the RON is just to decrease/reduces the chance of knocking or igniting under compression so it ignites at the correct time inside the chamber to create the optimum amount of power