Why is my Audi A4 suddenly burning through so much oil?

Before jumping to the conclusion that you've got a typical engine problem, you should first check whether your car was actually maintained properly beforehand - 2000 km in a relatively short time isn't necessarily a red flag if the vehicle was neglected before. Check the current oil level in the cold state on the dipstick and compare it over a few days to see if it's really dropping continuously or if it was just a false reading. If it really is going down, leaks at the crankcase ventilation, valve cover gasket, or even minor gaps in the engine could be the culprit - you should check those with a thorough visual inspection before you plan any major repairs.

Oil loss on a used A4 can have several reasons, and honestly, I'd take a look myself before rushing to the dealer. Check the underside for spots - if oil is dripping under the car, the problem's obvious. Also check whether the oil pan bolts are loose or the seal's shot. On a 2019 model, the valve cover gaskets could be porous too, especially if the car's been sitting around a lot.

A practical trick that a lot of people miss: top up the oil to the maximum level and mark the spot with chalk or a marker on the dipstick. Then you drive normally for a bit (nothing crazy) and check again after exactly 500 km - no long highway drives or extreme stress. That way you can see if the consumption's really that bad or if it just seems surprising at first. Some engines just have a certain tolerance, and 0.5 - 1 liter per 1000 km is in the gray area. But if it's really several liters, then you probably have wear on the piston rings or valve stems - then there's no way around taking it to a workshop.

If a car suddenly starts burning through oil when it didn't before, it's worth taking a look at the wear parts first - valve stem seals and the crankshaft seal are often the culprits, especially if the car is older or hasn't been driven in a while. Before you go into bigger repairs though, I'd honestly also double-check the fill level (some Audi oil dipstick systems are finicky) and see if oil is dripping under the car or if the engine is clean on the outside. 2000 km is relatively little to judge by - next time you top up, mark the level and note the mileage, then after another 2000 or 3000 km you'll have a more reliable picture of what's going on.

When was the last time you checked the oil level before the car came to you? For a used 2019 A4, the first question is really whether the previous owner topped it up regularly or if the level was just always low - you can tell if you check the service records. But 2000 km for a noticeable drop is actually too much. I'd first look under the car for oil spots, then get the seals checked at an appointment instead of assuming engine damage right away.