2002 Fox eye oil change.

[Jules-C]

Has /does anyone ever replace the crush washer on the sump bolt

Arnold Clark did on my car and that's the only time I've had a leak from sump plug. But that was nothing to do with washer but ham fisted mechanic crossthreading the sump plug.

I replace it on Fazer every 3 or 4 oil changes but only because I got about 12 crush washers and need to use them for something.  Never once replaced it on my Kawasaki that had covered 84,000 oil leak free miles before I traded it in