Try using ail with a stop leak additve (high mileage oil)if you don't want to get under it. If that doesn't work you've got to find the leak(sometimes this is hard). It helps to clean the engine off first(Engine Brite Foaming Cleaner or the like). You can then try tightening the bolts around the part that is leaking. This may not work. You'll have to replace gaskets/reseal the mating parts.