Pud: I have been thinking this too
It has not been driven since all of this save for a 1/2 mile test drive. We are fortunate in that we have other vehicles at our disposal.
(2000 A6 2.5tdi Quattro Avant, 1979 MG Midget 1.6, 1999 Honda Blackbird).
I have some interesting news. I spoke to a chap at Alfalusso today and on describing my dipstick, he informed me that it was from a diesel engine - immediately and emphatically. Petrol engines have a flat dipstick all the way up. He also stated that there was no way the engine could hide over 2.5 litres of oil. When asked what sort of damage could result from under filling he suggested bottom end stuff which sort of fits with what I'd expect.
With this information and your kind inputs below I have made a decision.
Purchased new tube and stick from Alfalusso for a tenner.
Fill Alfie with another 2.9 litres of oil and make mark on dipstick (there is an outside chance it'll hit the H mark - here's to optimism...
Booked him for full diagnostic check next Wednesday - he's failed the emissions so need to do this anyway.
So if anyone wants a used dipstick then I'm sure we can come to a deal...
AlfaGit: found this in my manual, not sure if it's anything you don't already know but:
The minimum oil pressure contact L2, fitted on the
crankcase, closes when the pressure falls below a
certain limit sending an earth signal to the cluster C10
at pin 10 of connector B and thereby turning on the
"minimum oil pressure" ~ warning light.
The attached JPEG is the circuit diagram to reference this. Don't think it helps too much other than to suggest it disappears off into the main loom somewhere. I'll have a look at the weekend and see if I can get a piccie or two...
I'll keep you all posted on the results..