Fuel grease vs. Natural gas? I am wondering what the overall pros and cons are of fuel...

I am wondering what the overall pros and cons are of fuel oil and raw gas. I am considering buying a house that has a fuel grease furnace and I don't want to get myself into something too expensive or strong to maintain. Please support! :)
My oven keep tripping my RCD?
Answers:    The amount of heat surrounded by natural gas is almost double BTU per BTU.
Gas is 100% verbs and safe.
However, beforehand you plumk down a lot of money to convert, you requirement to ask yourself, will the savings overcome the cost of the conversion?
How long will you live here?
How old is the current heat plant?
Cost per therm of both?
Call a HVAC contractor in your nouns that does both oil and gas and take a unbiased view.
Ceiling cracks - they are recent... why?
Natural gas