Ryobi told me the unit can't have the s430 trimmer bottom end raised higher than the engine at any time, or it will leak. Apparently they released a product to compete with other companies for cheap 4 cycle trimmers without much care for the end user.
My Ryobi s430 leaks from the camshaft. See no lip seal, so either it wasn't installed or a bad design.
SOURCE: Does a Ryobi trimmer S430
the Ryobi S430 is a 4 cycle engine. As such it has an oil reservoir which takes 30 weight oil. It uses straight gasoline in the gas tank.
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