My Audi has the 3l gas aprox 140000 km. I bought it a couple of months ago and have put 2000km. I 'am down a half a litter of oil.

My 04 a8l 4.2 never burned any oil. Should I be worried.

I know its been discussed to death, but I love my $30000 investment. Please let me know what you guys think.

 

In a word, NO.

You didn't mention what oil or weight you are running in it, which bears on the topic of 'consumption'.

In general, be aware that approx 1qt oil/1000 miles is the standard for 'excessive oil consumption', so you are no where near that. That said, there are known causes of added oil consumption related to emissions parts failing (PCV valve clogged up). Neither my '10, nor the '15 use any oil at current, but the '10 (at 113k miles) is beginning to ooze just a bit at the seals...early stages still.

Basically all Q7's are known to develop oil seal leaks around the engine of the car (as do most other Audi's, historically speaking), which then dribble down onto the splash guard's/undertray sound insulation and get trapped there, never even hitting the ground (unless you remove the splash shields for a bit to diagnose things under the car). You can easily take a strong torch/flashlight and peek under the sides of the car looking for oil spots or have someone do it for you, but all Q7's develop the oil leaks over time. The 'normal' known leak points are upper oil pan seal, turbo-pipe (only if you have turbo engine; root cause is a leaking turbo), the valve-cover gaskets, lower oil pan seal, and the rear main (engine) seal. The rear main seal can be done on the car, as can valve-covers, lower oil sump, and turbo-pipe related (turbo) oil leaks, if yours is a turbo engine.

In my case, oil consumption has always been a signal, rather than simply the 'engine's consuming oil', that something is amiss. Start with the low-hanging fruit (oil seal leaks), signs of turbo seal failure (oil in/leaking from the turbopipe, which is an air passageway supplying the turbo), rear main seal dripping, etc. Keep the PCV/crankcase venting mechanism on your radar though, as anytime those get clogged up on any car, they result in pressure build up inside the engine cases, which leads to oil loss, and eventual seals failure. Look for the common leaks, and if those are all dry, then circle back to the crankcase vent. Liqui Moly makes products to help remove the carbon build-up from the EGR system, which thickens over time, and especially when you have an internal oil leak getting into the air intake, such as the turbo seal, etc.