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Originally Posted by FordFociSHO
The other reason I bring this up is because the fact that most of us always have oil in our intake manifolds. Vacuum can not move a fluid. It's impossible. Pressure is what moves oil up the tubes and into the intake.
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I just reread this and started thinking (ouch), vacuum does move things, because it creates a pressure difference. Compresed air moves things in it's path when released because there is a difference in pressure between the air in the tank and the outside air, so air rushes from high to low pressure, moving things in the path of flow. When you create a vacuum there is a difference in pressure between the vacuum chamber and the outside air (so that the outside air is like the pressurized air in a tank relative to the vacuum), when you let air into the vacuum area it rushes in and moves things as well.
Technically, it is the pressure
difference that moves the air and the moving air carries whatever liquid or aerosol-ed oil with it, until the air slows down, cools, and drops the liquid (oil). While your right, it's not the vacuum that directly moved the oil, never-the-less, it is the creation of the vacuum that set the conditions for the pressure difference that allowed the higher pressure air to move the oil. So, a short-cut way of thinking about it is that the vacuum "draws" the oil into the manifold, even if that's not an accurate description of how it happens.