Please help. I hane an OS 120III without the crank case vent. I ran in the engine for the 1st time to day and thought I would remove the plug and insert some after run oil. I did just that however when I turn the prop it squirts back out (and all over the inside of the cowl). If I add the oil then insert the plug I cant turn the prop reguardless of how little amount of oil I use. How is anything getting to the bearings?