While you have your camera apart, you might as well oil a few of places that might be causing the shutter to either hang up entirely or drag and work slower than it should. This will cause it to have a slower shutter speed, which leads to blurred images. I have indicated the 7 points that should get lubricated. Keep in mind that only 6 should get actual oil while the center circle assembly should get graphite. It is the metal piece about the size of a quarter indicated by the arrow on the left/middle area pointing to the right.

Be sure to use regular oil and not a lubricant such as penetrating oil or WD-40. Those types of lubricants will dissolve whatever original oil remains and then evaporate, leaving no lubrication at all. Also be sure not to use too much oil on each point, perhaps put it on using a toothpick or similar pointed object. After all the points have been oiled, dab away all the excess oil with a paper towel. That way there will be no chance of it dripping anywhere it shouldn't.