Burning oil, help.......

Hello,
 
I have a 96 golf tdi, with almost 100k, the oil and filter have been change on wednesday and i just notice (sunday) that the oil is already black. Is there a way to stop the oil from burning? or is the engine will need some tuning?
 
Thanks for your help  

its a tdi
it will be black as soon as you chang it
deisles are very mesy

Thanks,
 
First time i own a diesel, good to know, i can stop worried