This seems a hard little bugger to find much info on.

Not having an extra one, I sprayed it off with brake cleaner and resused it on the previous oil change.

Is it to be replaced each time or after X # of oil changes?

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1974 240D "Boldie" 170K.- New timing chain/freshly rebuilt IP/replaced valve seals/injectors/upgraded stereo/new Bilsteins with Yokohamas/fresh paint and rocker panels plus lots of welds.