Bought certified BMX 335i convertible and after only 3000 miles of driving the low oil light is on. Is this normal oil consumption or is there a problem?

Depends on make and model. Cadillac Northstar engines often use a quart between 3000 mile changes, and this is considered normal.

its used how much ?? thats 8 pints of oil which is about 5 litres in 3000 miles whats it doing leaving a blue haze behind it ,i think this engine needs looking at as this amount of oil consumption will kill the catalytic converter

No more than 1 quart between oil changes ... usually about 3000 miles under most circumstances.

if you lift the hood the dip stick is yellow,check the oil level with engine off.

I have a 2007 335i convertible.. my low oil light went on.is there a dip stick or something. how do i tell how low iam

you may want to upgrade your oil to a thicker oil that helps alot more than people think its normal anywhere from 1qt to 1/2 a qt every 3000 miles that sounds pretty good and a healthy engine upgrade on brands and viscosity that should take care of that but it will burn more oil if the engine is being broken into for the first time if its brand new

i say change your oil every 3000 to 3500 miles no matter what any little monitoring system says!!!!!!
oil is the lifeblood of the car and is the key to a great, long lasting vehicle.

You will need to change your head gasket. You need a headgasket set. All of your seals are going bad. You have a little oil going through your exhaust manifold, and the heat is cooking the oil. If you dont change these seals soon, you might have to buy a new catalytic converter. If your converter cooks all of that oil, it makes your engine very noisy.

oil consumption is normal on BMW's especially if you drive the car hard and especially if it is still cold.

Drive slower and easier. about 1 or 2 BELOW THE SPEED LIMIT DON'T PASS ANYONE . When you accelerate accelerate nice and easy watch the tachometer try to keep it below 3000 rpm all the way up to your cruise speed nice and easy don't worry about the guy behind you . Brake easy if you are coming to a light take your foot off and coast and try to time the light so its green when you get there. then EASY EASY on the gas keep it under 3000 RPMS all the time you are accelerating.
No special oil no special spark plugs or fancy air filters just factory parts whren you tune up every 3 or 4 years and change your oil about every 3 or 4 years yes 3 or 4 years it wont hurt it a bit just remember to always check the oil and add if it gets 1/2 Qt low. change the fuel filter EVERY EVERY 15,000 MILES fuel injection professional pressure cleaning once a year Air filter when it is dirty, please dont believe all those gimicks out there I have a car we change the oil about every 4 years and it has 350,000 miles no engine work yet runs every day passes emsssions every year no repairs needed fuel filters once a year or 15,000 miles