If you've got hydrocarbons in the coolant you've got a bad head gasket, or even a cracked head. Last car I had that showed hydrocarbons in the coolant had cracks radiating from every valve seat. If it is the head gasket, it might not be blown yet, but heading that way.

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Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon TDI...at least its a diesel

Non illegitemae carborundum.