1994 BMW 525i Q&A

1994 BMW 525i Question: WHAT DOES A BIG WOOF OF SMOKE OUT THE PIPE MEAN?

I recently bought this vechicle from a family member an when I drive the car it smokes alot. It comes from the back the gas pipe. I put oil in it an it seems to not smoke as bad please help me? NO CHECK ENGINE LIGHTS ARE ON. -
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