Does hjgher octane gas cause more carbon build up?
Alright, I know this question has been asked many many times, but I only want to know, will using 89 or 91/93 octane in my sentra 1.8 cause more carbon build up than using just 87. I know that there will most likely be no performance gain and no better gas mileage increase. It used to be, some say anyways, that the higher octane gas had better cleaners in them, but now all gas is supposed to be the same aside from cleaners. I've heard that using higher octane gas will cause more carbon build up, but others say that using a slightly higher octane rating, say 89 instead of 87 may fight off the knock/ping caused by a bad batch of gas and offer a little more protection. I know I'm opening a can of worms here, but will higher octane harm my engine? That I guess is the ultimate question.