Decided tonight (Sunday) to give the Z her second oil change. The first was done at 2500kms and this one was at 6500kms. Nothing serious to report. The oil was dirty and after draining the pan into a "travelling" container (to dispose of the oil), I had a look at the drain pan. Nothing to report. No debris of any kind.
I replaced the crush washer on the magnetic drain plug, used 5 litres of Amsoil, a K&N filter and reinstalled the Filter-Mag. The air filters are still clean and everything looks great underneath the car.
Onwards.....