This is a 1 fl. oz bottle of Pacer After Run Oil. If you are not going to be running your engine for a while it is always a good idea to put some after run oil inside the engine to avoid corrosion from moisture. The best way to get after run oil into your engine is to remove the back plate of the engine and put some inside, then close up the engine and turn it over in your hand. Another great way is to feed the oil into the carburetor and turn over the engine on your starter box to get the oil to spread evenly through the inside of the engine.