Well according to a hand scrawled reciept for a "full service", just before I bought it.
But I suspect more than likely never, seeing as the new plugs that where also fitted during this "full service" weren't new, both where different, and neither where the right one.
I also suspect that little lot of scrap is 12,600 miles of the oil pump drive gear that's about to be changed. I hope so anyway.
I'll dig the receipt out when I get chance, and see who the reputable establishment was.
Although there is some record of servicing with a Harley dealer somewhere, for what it's worth.
I'll change the oil again after a short run, and see if there's any more.
Warhorse was a lucky horse the day I found her. Poor poor mistreated mare.