2002 volvo v70 2.4 D5, oil leakage? on 2002 Volvo V70

My volvo, seems to have developed a leak of an oily substance that is making its way from the drivers side through to the centre of the underneath guard plate at the front of the engine bay. There are no aparent signs of leaks anywhere, although i have a few drip marks on my drive. its been suggested that its from the intercooler, but i am not so sure... anyone have any ideas please?

Asked by for the 2002 Volvo V70
pressure wash complete eng then add oil leak dye to determine oil leak source
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