I have try on ron 95, there is no different at all, pick up also ok, same with ron 97. The only different I can notice is "Price"

for the engine lube, I agree that, if they pour all 4L into the engine, it will feel sluggish, and slumber abit. So I suck out 250ml and I can feel better pick up, but fuel consumption is worst than before I suck it out.   I also don't know why