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200 is the MINIMUM for cold starting. Perfect compression is around 400 I believe. Most have around 350 or so. At 200, glow plugs are very critical and a block heater/extreme measures become necessary below 40-50* F.
Doing a valve adjustment and an MMO soak for a week has the potential to raise compression into the very good range, but only if the rings are stuck or gummy and not worn out legitimately.
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