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Some thoughts:
This oil is not full synthetic. It contains sulfur. Not a good idea in an full aluminium engine.
The detergents for a diesel engine are different from an fuel engine. Don't understand why you choosed that oil – because of zinc?
But i think the problem here is the amount of metal found in the oil. Because of the iron and chromium maybe you should check the IMSB. Don't know if that is caused by the diesel engine oil.
Regards, Markus
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