I bought my car last year and then the mayonnaise started. I too thought **** but it didn't/doesn't use any water. This disappeared when the weather warmed up. I do a 64 mile round trip commute so it gets nice and warm and I check my oil weekly and this week there is a sign of mayonnaise appearing again although not as bad as yours. Clean it all out and monitor it but like already mentioned it's ok unless your loosing water.