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Subject:Re: gas consumption and guiness in the oil
From:Kent Christensen
Date:Wed, 8 Mar 2000 19:26:08 -0700
My aircooled did this too.  It doesn't any more and I fixed it either
by

1.  new seal ring in oil filler tube cap
or
2.  switching to synthetic oil

I think water leaks into or condenses from the atmosphere in the
filler tube.