You're video proved that carbon deposit built up more after using the recommended fuel additive. Look at video time 11:11 . Before using Additive, you can see center ring. After using carbon deposit built up so thick that it cover up the center ring until you can no longer. see it. And you still can see metal surface on the left bottom near the valve cut area, Hoover deposit cover up that area after using the additive. Look at 11:20 next to valve cut area can see metal surface before using the additive and it was covered with carbon deposit after using Additive. You should try emission test after a few tanks of duel without using this additive. You will see a different result. I predict.. It will be worse than before you use the Additive. Since your video visual show me the carbon build up at higher in most area on piston top. If you have done compression ratio before and after, I'm sure you will find it higher after higher because of more carton volume on the piston top after using the additive.
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