Thanks Sean.
The MMI readout never alters at all which seems to prove that there is a possible sensor malfunction. I've just found a universal dipstick for Audi which has an adjustable upper stop that rests against the dipstick tube and effectively alters the length of the dipstick. There is a scale at the bottom from which you can take a reading. It includes (supposedly) all VAG engines including mine CDSB. It's not designed to be left in place but only to take a measurement then the plug replaced. I'll be able to cross-reference it for accuracy with 2 A6 owners I know, obviously adjusted for their engine codes.
I'll keep you posted.
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2010 D4 SE Executive 4.2 TDI
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