Most likely you can unscrew the front an rear lens cells from the shutter. Don't take the cells themselves apart! Lighter fluid, cotton swabs (Q-Tips), and patience over a few days time should solve the problem. Squeeze a bit of the lighter fluid on the blades, use the shutter over and over for a few minutes while trying different shutter speed. Mop up the mess with the swabs. The shutter should get more consistant and end up pretty much oil free. Let it dry out over night and put the lens cell back in the shutter. It shold be workin OK at that point.