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While attending a Buderus furnace class, I was told that in some parts of Europe old oil burners of certain vintages (15 years or older maybe?) used for home heating are banned, and that modern efficiency level replacements must be installed.
A little off topic - Buderus has one (prototype?) oil fired unit where the exhaust fumes are actually lower in temperature than the heat gain left inside the furnace. I don't know how that rolls - over 100% efficiency? The smoke is so cold that the sulfuric acid byproducts in the spent oil's smoke need to be managed by adding limestone to the juice that drips back down the chimney. I believe that there is a sump for the acid in the flue below where the smoke pipe connects. I believe the sump is where the lime goes to tweak the ph.
The Buderus class was a few years ago, which is 17 eternities as far as my failing memory goes.
More Buderus furnace fun facts (yawn!~) Another Buderus prototype that burns the usual #2 oil has been in use heating a cold weather location milking parlor or the like for a couple of years. It is cranked down to lean burn so hard that the fire box shows no evidence of combustion, and is still silvery clean and new. (Must be stainless if silver & not rusty? Not sure.)
Jeeze, i hope when we are at the rally and stuck in that little cabin in the pouring rain that this won't be a topic of conversation. 
if life gives you lemons keep them because hey,free lemons.
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