Cold weather causes the oil pump to "cavitate".It cant pull the stiff oil in through the pickup screen so it runs out and doesnt pump anything except air for an instant.A thick additive will make this worse when it gets real cold.Lifter clatter could be because the oil was so thick it wasnt going through the passage good enough to pump up the lifters,or oil was so cold that it was all getting pulled out of the pan and not getting back to be picked up again quick enough starving it for oil.Also if you tear down a motor thats had STP run in it,it will be worn out everywhere.Thick oil and cold weather are hard on bearings and motors.Might be different if the car was in a heated garage every night or plugged in to a block heater.
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