Hi Clifford, many thanks for your reply. I have to admit that up until the last MOT in March I have never needed to top up the oil. Obviously the oil was changed each year when the car was serviced. Since March though I have used about 2 litres and I have done about 1100 miles (due mostly to going to Audi specialist in Newcastle several times). There is a pool of oil on the ground below the engine where the car is parked overnight. As for the Audi recall to fit new pistons, I have no receipts from the previous owner for this work. I have just had a quote from the Audi specialist for replacing the crankcase gasket of £1,005 incl. vat but with the following comment - "we cannot guarantee this work due to a relevant TPI in relation to excess crankcase pressure resulting in modified pistons".
The vacuum pump cost me £500 so with the cost of this crankcase gasket the total spend will be £1,500 with no guarantee that this work will cure the leak. An impossible situation.
Kind regards,
Colin Dimes.