Well... Straight away the low oil pressure light started flashing up to around 1300-1500 rpm, cold or at running temp.
I contacted dealer immediately.
It is now in their hands, and I'll know something by next week.
1. Faulty oil pressure sender?
2. Pressure relief valve stuck open?
3. Oil pick screen plugged? (why?)
4. Incorrect engine assembly, rod and/or main bearing issues?