Hi All.
An update.
The engine rebuilders replaced the valve stem seals with a better type so that will fix that problem.
While the car was there, I took a snapshot of the last suggestion about disconnecting the battery and gave it to the mechanic. He tried it and guess what, no pressure build up.
I got the car back on the weekend and tried it myself. I parked the car and let it sit for about 2 hours and then disconnected both battery terminals (I didn't think to do it immediately after parking it) and let the car sit for another couple of hours. There was still pressure there when I went to remove the cap but not a lot. I then checked it another couple of hours later and no pressure. I checked it this morning before I left for work and still no pressure build up.
So, if it is electrolysis, what can I do so that I don't have to disconnect the battery all the time?
Any thoughts?
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