Agree with HK 100%. It won't hurt the actual engine as long as the octane rating is enough for the compression ratio.

It will however eat away all the rubber seals and hoses in the car that it touches over time.

I personally wouldn't touch it with a 10 foot pole, I only use BP ultimate (if I can get it), or Shell V-power, or Caltex 98 in any engine I own.