BMW 320i is using 5L of oil every 1000miles no

clean the engine and check where it is coming from. Is it at the front of the rear> do you smell burning oil when you switch off the engine? Clean an area under the engine compartment and see where the oil is dripping from and get back to us. Typical places for leaks are the valve cover gasket, oil filter housing bracket.

Use a good synthetic oil 5W30 or 5W40 or 0W40. I think you have to use the bmw long life oil rating.

depends on what engine you have if it's a strait 6 cylinders it's 6,5L.

if you have the n20 4 cylinders then it's 5L.

suppose to be the reading of the dip stick is in it maximum level,not more nor less, to make lubrication system work well.
yes,
have your car change oil regularly, but, have you change the oil filter?
if not, change it.
and i suggest you to have technician with scan tool to diagnose the problem.

If it is leaking, then it is not. Cars should not leak at all.

If it is being burned in the combustion process, some of that is normal — the older the engine, the more miles, the more so.

If it is burning a lot of oil, repairs are probably in order.

Oil can leak down the valve stems (which, if it is severe enough causes smoke on deceleration, due the the increased vacuum the intake valve stems undergo), or past the oil-scraper rings on the pistons (which, if severe enough, causes smoke an acceleration).

If this is not severe, switching to a slightly thicker oil can completely eliminate the problem. Don't go much higher than the recommended oil though, or you can introduce more serious problems.

did you look at the rear of the engine? these car had problem with leaking valve cover gasket.
it leak on to the heat shield above the exhaust manifold and it will burn off before you see it.

The oil has to be going somewhere, do you drive it really hard? Is it smoking at all?

Usually this just means that you are a quart low on oil. Check your oil and if it needs it add it. This should make the light turn off.

U can keep driving, just make sure the oil always shows on the dipstick when u check it, if not then u can cause the engine to just freeze up from lack of lubrication.

Look for Castrol TWS 10W60 Motor Oil. This car should not burn so much oil, you need to use a different kind. It is recommended by BMW as well. I also heard the VANOS isnt an issue anymore, can be fixed with a different MAFF. Good luck!