Be on the alert for oil or red dye.  Red dye is placed in a propeller so that if your propeller hub or the blade seals develop a crack you will be immediately alerted.  If red dye is evident, the propeller must be removed from service and sent for repair immediately. If you are faced with a red dye leak, do not fly. The propeller may or may not be the problem if you spot engine oil.  Engine oil leaks may be the result of a pinched O-ring or crankshaft seal.  If you have a minor oil leak after installing your propeller, depending on the model of the prop and per the manufacturer's instructions, you are allowed to see if the propeller will seal itself.  

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