There is no way that a 4.5 hp engine can create 4500 psi. If you are putting the oil into the engine it would just take a 10w30 motor oil, if you are putting oil into the pump I would have to know what pump kind of pump you have, if the name isn't on the pump I would need to know the model number of the machine. The oil in the pump shouldn't have any affect with the motor not starting though.
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