Engine Mechanical problem
2006 Toyota Sienna 6 cyl Front Wheel Drive 21000 miles
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my 2006 toyota sienna makes a snocking noise since it had 1,500 miles. I took my 206 toyota sienna to the dealer for check up, but they couldn't hear the noise because doesn't always do it. it only make the noise when going up hills or acelerating. then a took my car again to the dealer and one of the technitians told my that the noise is because the gasoline i'm using, he told me to put 93 octane gas for about 5 tank of gasoline and that it should go away. i definetely did it, my car reduced the noise in a about 70% but it ketp doing it. should i be worried about..

some mecanics told me ti put a octane buster and that that should work really good. should i do that.

should a 2006 car with 21,000 miles be doing a snocking noise?