The DV6 1.6HDi is an excellent engine - and in various guises used by Ford, Mazda, Volvo and BMW as well across the entire PSA range.
The oil goes black very quickly after it's changed, and is perfectly OK, though it does look awful.
The oil MUST be changed no later than 12,500miles/20,000km. This is to ensure longevity of the turbo.
PSA drop that to 10,000miles/15,000km for "severe conditions", which means short journeys or operating in cold climates, as the DV6 is renown for running cool. A winter grille is recommended below about +5°C.
By all means change the oil more frequently but use only genuine PSA filters. Clones are well known for causing pressure problems, the first sign being noisy tappets. More advanced signs are oil pressure warnings when idling. Using the genuine filter will cure it all.
Change the oil on schedule, and expect good economy and a high mileage from the engine.
Edited by BigJohnD on 09/09/2010 at 19:33
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