More than likely, if it is smoking as well, it is your oil rings, or blown head gasket,a major problem...
Sounds like the piston rings are shot. Engine is worn out or mistreated. If this is true, it will probably also produce bluish smoke, when running.
Bad Piston,Bad rings,bad valve seals,Cracked cylinder head.cracked block. Don't forget now there is a lot of suction and compression going on in a motor. If any of the above are happening in an engine the suction will pass oil through a bad piston or rings or any of the above and cause Blue smoke and spit oil out the exaust along with blue smoke.
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