Oil Boilers are more reliable, easier to service, & last longer than Gas boilers
Easier to service? You have got to be kidding. Filthy baffles (x2 if its a condenser), new nozzle, clean photocell, smoke test, gas analyser, filter change, fannying around with Crosland bowl seals 10mm from the dirt. New hose(s).
Stinky horrible Kerosene.
How can that be easier than gas?