Posted by mowr on October 05, 2008 at 20:15:52 from (67.96.1.66):
In Reply to: Re: oil draining posted by Gene Bender on October 05, 2008 at 04:27:10:
If the engines and transmissions didn't have breathers, the pressure created by the expansion of the air (and liquid) when it's warmed would force the fluids past the seals. Conversely, the vacuum created by the contraction when cooled would draw air in (with its dust and dirt) past the seals. The engineered-in "breathing" that takes place during warming and cooling is the way air enters with its accompanying water vapor. The resulting condensation causes the water buildup that we observe in things that sit even though rain can't get in. Also, some metals sweat (condense moisture) much worse than others and some climates are much more humid than others, causing a faster buildup of water.
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