whats wrong with my car

2000 ALL OTHER MAKES ALL OTHER MODELS
150,000 MILES
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LEXI MAINS
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i am going though a full tank of gas in 2 days driveing 40-50 miles a day and i have to put a curt of oil in ever 2 -3 days it is not leaking out anywhere ans one i had my oil changed they said the had no ideah what was wrong with it it also is blowing out black smoke sometimes it is a 2000 olds mobile intrigue with a v6 ingen
Sep 29, 2012 at 8:01 PM
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HMAC300
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check to see if you have a vacuum leak or a blown intake gasket.
Sep 29, 2012 at 8:08 PM
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KHLOW2008
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The black smoke indicates the engine is running rich and this would mean increased fuel consumption.

The oil loss could be oil being burnt in the cylinders and the black smoke is covering it up.
Sep 29, 2012 at 8:09 PM