Possible places to leak engine oil.

1. valve/cam cover gasket. (make sure 10mm nuts are tight)
2. Back side of head dime size drain hex bolt. (Need mirror to see)
3. Head gasket. (look atrear of head passengers side)
4. Oil feed tube to turbo from passengers side of block and under turbo.
5. Oil pan. (check 10mm bolts for tightness)
6. Aux side mounted oil pan. ( check 10mm bolts for tightness)
7. Injection pump to block large O-ring seal.
8. Rear main seal. (evident if leaking oil between at bottom of bell housing to block)
9. Front main seal (evident if oil around front main pulley wheel)

I hit most common areas but put car on ramps and look while engine is running.