Hi all. Anyone with a 4cyl tacoma see this before. There is milkshake on my oil cap. I cleaned it 24 hours ago and it's allready starting to come back. I hope i'm wrong but i am thinking head gasket. My mileage has also dropped by 5 mpg and it may not be related but my clutch hydrolics don't seem to like the cold. Any input would be helpfull. Thanks!! It's still on warranty 22k miles.