MY 64 BJ8 gets a little water under the rocker cover, as I notice some milky oil under the filler cap. Removing the rocker cover, I find a little milky oil (sludge) there too. However, I don't see any evidence of it when changing the oil and filter. Raditator loses a little water when driving, but not much. No green residue (from antifreeze) on the spark plugs when I have pulled them. I have tried the K & N head gasket sealer product, but not much change. Is this somewhat typical? Not sure if I want to pull the head if it isn't a big problem. My newly acquired BJ8 only has about 51,000 miles on it, runs great. I probably will only put a couple thousand miles a year on this sweetheart. Sure don't want to look for problems if none exist.