Ford Focus: ford focus 1.6l oil consumption 2l in 500km

i friends my car since the last revision consumes 2 L in 500km
which could be the problem ?
I after this made some tests:

109000km

106cv in bosh machine test ...compression ok ... no oil in the air filter or
in the water system
very smoke in 5000 to 6000 rpm

thanks

A.M

"per" wrote: 

hi

no leaks , no lights on, nothing, the motor appear work fine , the
smoke is very intense only in the back ...first black smoke them white


thanks

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