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Slowr6, mine is completely dependent of ambient air temperature. If it's in the 20s or 30s outside, it will usually do it, following that random pattern. Recently, since the weather has been in the 40s and 50s and 60s, I haven't heard it at all. I think it's a function of oil temperature. When the oil is really cold, it just doesn't get to the top of the engine quick enough maybe. Dunno... ??
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