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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Today's Featured Article - New Hitches For Your Old Tractor - by Chris Pratt. For this article, we are going to make the irrational and unlikely assumption that you purchased an older tractor that is in tip top shape and needs no immediate repairs other than an oil change and a good bath. To the newcomer planning to restore the machine, this means you have everything you need for the moment (something to sit in the shop and just look at for awhile while you read the books). To the newcomer that wants to get out and use the machine for field work, you may have already hit a major roadblock. That is the dreaded "proprietary hitch". With the exception of the
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