I have an 05 WK that is consuming coolant. I have checked the oil for coolant contamination and the oil looks good. No evidence of the "coffee w/ cream" look. The water pump has been replaced not too long ago so that is not the issue. It did overheat in the past briefly so that may have been the cause if it is a head gasket. The engine runs ok otherwise with no unusual exhaust smoke. I do smell an odor of oil cooking like on the engine and one valve cover has a trace of oil leakage. Any thoughts on the issue other than head gasket? What are estimates to replace a head gasket if that is the issue?