I removed my valve cover gasket today to replace the gasket, and noted water mixed in the oil. I used a head sealer years ago which worked for a long time. But maybe it's leaking again. Questions: Will the vehicle run this way so I can take it to a mechanic without making things worse? Can I use the sealer again and expect that it will/might work? What is the next step, do a compression check to confirm the head leak? David