I'm thinking of adding a few drops in the plug hole to protect the engine of my car, which is better, Bell Hammer Phantom or Yamanaka Special?

We recommend adding LS Bellhammer Yamanaka Special to the engine through the plug cap of a car that has not been started for a long period of time, and adding Bellhammer Phantom to the engine oil of a regular car (use through the filler cap as specified).