A drop or two is not nearly enough ATF (or any after run oil) to do much good. You need to get enough into the engine to coat the front and rear bearing and connecting rod bearings in order to do any good. After all, the object is to displace any residual nitro and alcohol to protect the engine from rust or nitric acid (nitro and water form a dilute nitric acid--the water is attracted to the mix by the alcohol in the fuel) That means around a half teaspoon full or more and with you manually rotating the prop a few revolutions after you put in the oil to distribute to the points needed. It helps to rotate the engine while you are rotating the prop to get the oil to all parts. Yes, that means your first start after using ATF will take a bit more effort but the fuel will quickly remove the ATF (or any after run oil) when you go to start it up.