Diesels have migrated in perception from being associated with clattery farm equipment, to sounding almost like their petrol counterparts, aside from at idle, when the difference is more obvious.
In fact, with new direct-injected petrol engines, the idle noise is suspiciously diesely, so even if some modern oil burners still haven’t done away with the characteristic small hammer quickly tapping on pipe sound, they should be given a chance and tried out, even (or especially) by those who thought they didn’t like them before, simply to have an informed future opinion, if nothing else.
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