After just 600 miles the new synthetic oil in the 2L turbo engine is very black what is that a sign of

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Diesel engine makes oil black in seconds, dont worry about it, if oil has been changed from black to something else then u need worry.

If its a petrol engine black oil should be after 5k miles. 

And do your oil change twice a year if you do less than 10k miles (year). Thanks. 

Hello and welcome to ExpertHelp.com! My name is Edgars Uzulins and I'm going to do everything in my power to answer your question to your full satisfaction!

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Diesel engine makes oil black in seconds, dont worry about it, if oil has been changed from black to something else then u need worry.

If its a petrol engine black oil should be after 5k miles. 

And do your oil change twice a year if you do less than 10k miles (year). Thanks.