--Does a lockable gas cap get a proper seal over time? The lose spin after locking makes me raise the Q. --If a person were to replace a cap, which is better (lockable or unlockable)? --Does changing the gas cap gasket do-the-trick? --Where is good place to pick up a OE quality cap (other than dealer)? Began thread because I found gas on the rubber gasket. The gas was NOT due to recent gas fill or plugged drain.