Wow suddenly this topic become hot again. Ok guys despite all the theories, do you realizes (some of u will shoot me for this question). Using Ron 95 your engine bay gets hotter? I meAn just stand infront of your car after a drive. U will be surprise to feel the very  warm heat that I never experience before when I was using 97. I have been using 97 for a year. Then try out 95. No doubt 95 makes the the engine raw and no power and sometimes I can hear my engine pings. I have been using 95 for 6 full tanks. I can tell that 95 is not a pleasant fuel to drive. It just make too much noise and sluggish. In long run it may damage my car. After using back 97. Everything goes back smooth and normal. Oh yeah and the engine bay warm temputure. When back to normal. No more very hot sensation.

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Added on July 30, 2012, 1:38 am
Is it 98? That is what I heard.

then ur car can use ron95 mine dont know why cannot .. i travel a lot before the launch of ron95 my car no problem not new car second hand local car .. before the ron95 use for 5 years no single problem service every 5k fully syn .. after ron95 use no more then 2 years gasket blow . oil leaking from distributor .. engine become hot . some will say it is coincidence .. i dont know i just dont trust our ron95 .. ur car use ron95 no problem u can continue to use i didnt force u ..

now my old car still use ron 95 bcos already know what need to service every year before the problem come out..

new car no ron95 ron 97 all the times .. u say it a waste to use ron97 if the car can use ron95 . not for me .. i rather pay extra now then have problem later that all .