I have a 1999 A3 1.6 Sport. A couple of days ago the oil warning light came on flashing at me as i drove to work (red dipstick icon flashing and buzzing at me). It then went off, but came back on a few minutes later. I dipped the oil and it was half way between minimum and maximum levels (which are not very far apart). I bought some fully synthetic oil (Local Audi franchise filled it with fully synthetic when it was in for service in March and turn on long life servicing) and put in 3/4 litre only to have the same warning this morning, but then go off after a few moments. To the uneducated, me, this screams of a dodgy sensor?! Any thoughts appreciated. PS I have a warranty policy from the dealer i got the car from, wondering what the fault could be to check if it might be covered!