Here's an hour meter from Radionics.ie that you would wire on the cable off the stat on boiler to the burner.
[broken link removed]
I think it starts counting time when the stat call for heat from the boiler. Multiply that by the flow rate from the boiler spec. and you'd have the oil usage. Seems a lot more complicated than installing a flow meter on the oil line.
I can't see my mother doing this!
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