andy as your engine warms up the hydrocarborns mix wit the oxygen in a diffrent ratio or ballance creating more h2o (water) that blows down the bores into the crankcase more ware, more blow by, more water in the crank case = more mayo
when a engine is used more it heats up nad the water is turned to vapor and expelled via the crankcase breather.
the problem is the crusty desposits that are created by the mayo gets into the oil pickup and colgs it over time.
this was typical of 80's engines that was over come with thinner oils of better quality and tighter running clearinces of more modern engines and fuel mixture control systems
hope that helps
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