No, its because it just idles that much smoother when I put it in there, and run a bit through. I always use good quality gas, and never get pinging.

However, I run a few gallons to burn off excess carbons, and to clean the motors internals.

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-Justin

91 560 SEC AMG - other dogs dd
01 Honda S2000 - dogs dd
07 MB ML320 CDI - dd
16 Lexus IS250 - wifes dd

it's automatic.