I have a 2005 hyundai elantra 2 lit crdi,manual transmission,has done 100000 miles. For the past few…

I have a 2005 hyundai elantra 2 lit crdi,manual transmission,has done 100000 miles. For the past few month it has been throwing a lot of black smoke during the initial turbo spooling and using up a lot of engine oil. The oil also turns black after a day of oil change
Do u think overhauling the engine is a good idea? What do u think the problem could be?
I wish to restore its motor since it was my first car. Would it be practical?

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