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I just don't get why anyone would rely on the oil warning idiot light before topping up (which is possibly past the point of increased wear being incurred as a result of low oil pressure), especially if the engine drinks oil, as this one seems to. How hard is it to pop the bonnet and check the dipper every fill up/whilst topping up screenwash etc., it's a high performance engine after all, and the cost of a new 'un is horrendously high.
Mechanical sympathy, much? Crickey, if I did that on most bikes I've ever owned, they'd have been toast.
It doesn't have a dipstick, the car is not supplied with one, and Audi don't make them, Audi's official position is it's not required.
It's not a 'low oil warning' light, (or an 'idiot' light as you so kindly refer to it), it's an advisory that the oil level is one litre below maximum capacity, and that the driver should add one litre of oil (but no more) at the next opportunity. (The message on the screen explicitly states that it is safe to continue driving normally.)
It is possible to buy third-party dipsticks (Audi don't make one that you can buy), and some people go down that route, but by all accounts the sensor as fitted is (a) reliable and (b) flags itself up as defective on the very rare occasions when it fails.
Also, you can read the oil level at any time using the MMI system in the car, and it'll show you a graphic of a bar on a scale of 0-100% (where 0% is one litre below max, and 100% is max). In old parlance, it shows the equivalent of MIN and MAX on a traditional dipstick.
The oil capacity of the engine is 6.2 litres, so I'm currently running with 5.2 litres, hardly into mechanical damage territory.