That is not true. If you pump Shell & Petronas 95, i can confirm it has the most aggressive cleaning agent out there. How i know? I drive an old carburetor engine car. And when i pump Shell for a month, my fuel filter will be clogged with rust/ particles. And my engine would die of fuel starvation. This happened 3 times already in many years. When i'm on Petron 95, i do not have this problem. I wish i have taken pictures/ video of my fuel filter to tell you. Else its just words. I want to have proof to tell you Ron 97 does not clean any better than Ron 95 except making power for engines that are built/ tuned for it.