Q: Abnormal oil loss

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Hie...my 2006 bmw e90, petrol has of late started loosing oil at an alarming rate.started around june or july. Took it to a mechanic who amongst other things a profile gasket...told me the oil level sensor was faulty. Bought the oil level sensor. The other mechanic who changed the oil level sensor about 2months after the service and profile gasket change, realised the oil leaks underneath the car, esp to the right. He couldnt tell exactly where the leak was from and adviced to have it inspected by the guy who did the initial work. Took it back to the initial garage a week ago. They changed the oil sump gasket as well as the oil filter housing seals...now after just a week, i have noticed an abnormal oil loss, and when you press the accelerator, the is a blue smoke from the accelerator. But the is no oil leakages noted on the floor..please help....note that there are no codes on the machine. pkelebeletse@yahoo.com

My car has 208467 miles.
My car has an automatic transmission.

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