Was using a premium fuel with 95 octane at caltex before and had encountered engine knocking. I switched to racing nitro of shell at 97 but still knocking. The knocking only stops when I used the petron blaze 100 and ive been using it ever since. Just wondering if it would damage my engine if i continue to use it? Car is running more smoothly though after i swtich to blaze. My car is a corolla 1997 gli.