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cat 950H black smoke

hi , i have cat 950h , 2010 .

i have a serious problem with it , all the time have a black smoke a lot of smoke , i call our country reseller for resolving this problem but unfortunately they didnt know whats the problem , they replace so many parts even the engine oil they change it but no way they didnt knew what is the problem . 

im from israel , i have the cat from 6 monthes and no one knows whats going on with it . 

any help please , thanks a lot