My BMW 3 series
If you are loosing oil,and have no visible leak,s,it is being lost out tail pipe,and some time,s doe,s not smoke,until you are going down the road,you want see it,rev up motor hard,you will see it,and check tail pipe for black sute,with your finger.
Check your crankcase vent valve and hoses, sometimes there is a blockage and oil ends up being burned in the engine.
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