I asked to have your post moved to
http://www.askmehelpdesk.com/heating-air-conditioning/ You might check the sticky at the top of that forum. I am not sure you gave enough details for us help. You may need to read the stickies to learn enough to give us a better description of your system and the problem. Does your boiler supply hot water to your faucets with a separate furnace supplying hot air to heat the house? Or is this one unit that supplies hot water both to wash with and for hot water heat. Can you tell us more about where the oil is dripping? Tell us more about the 30 psi valve.
If we fail to help you solve your problems, try somebody in the repair business rather than the heating oil supplier.