"While running, the oil is hot and is forced from the dipstick tube and when "it" cools, it is drawn up in the tube.O-ring on the dipstick has a good seal and won't allow the oil to return to the oilpan"
"It" would be the crankcase gases in this case. When the hot air/gases in the tube cool they create a vaccum that draws oil up the tube. Break the seal and it drains back into the case.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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