This may be true for cars with knock sensors, but for cars without (meaning, the timing will not adjust for pinging) like 107's, it would be a good idea to put octane booster in the car if any (any) knocking is heard.

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86 560SL
With homebrew first gear start!
85 380SL
Daily Driver Project

http://juliepalooza.8m.com/sl/mercedes.htm