Black oil in water tank

2004 Vauxhall Corsa 1.3 diesel
Car: Vauxhall Corsa
Year: 2004
Variant: 1.3 diesel
Black oil in water tank does not over heat no cream in oil dip stick or filler cap please give me a Idea could it be the oil cooler please help me as it's my daughters car and needs it for work thank you dp
Problem added: Jul 15, 2017 (6 years ago)
Usually faulty oil cooler .
Answered Jul 15, 2017 (6 years ago)

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