Andy,
Have you found the source for "The valve lash spec is actually .1mm plus or minus .05mm (.002-.006 inches)." I have search all my (+20) Porsche manuals with no luck. I am certain that the factory never made this recommendation in their publications, and would not advise anyone to go below the factory spec, regardless of the climate. I'm sorry, "It's weather".
Paul
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Paul
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