Answer by  
                                                                                          Amber40 (24961)
                                                            
                          
                          
                                                          This could be because of a lot of thing. The most likely is there is a bad seal somewhere. Seal get hard and crack as they get older causing leaks. Another cause of the leak could be a loose component. Bolts can work loos over time causing thing like valve cover to leak. Do so inspecting to find the leak.