Save your money. Run it on 91 octane, and make sure it doesn't ping on acceleration by adjusting the timing exactly to spec, and your engine will live for a long, long time. Dick Benjamin (owner until yesterday of an identical car). ----- Original Message ----- From: "Anthony Bungaro" <abungaro@xxxxxxxxxx> To: <mailing-list@xxxxxxxxxxxxxxxx> Sent: Monday, May 24, 2004 8:48 PM Subject: IML: lead additive I own a 67 Crown convertible Does anyone know if adding a lead additive (into a full tank of gas) everyother fill up or or once in a while is helpfull or beneficial for the engine and or performance?? Is it good--or is it just a waste? I always use premium grade (and go to different gas stations) THANKYOU ANTHONY BUNGARO