After Run Engine Oil
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Prather's After Run Engine Oil is formulated to protect your engine while it is not being used. Prevents gumming and rust, extends engine life, and makes for easier starts.
After a day's flying, pull the fuel line and run your engine dry, put a few drops of Prather After Run into the carb and turn the engine over a few times to draw the oil into the engine to coat the inner surfaces. Excess burns away upon next startup.
Comes in a convenient squirt bottle that can be used for a primer bottle when empty.