Shooting oil out of dipstick

Check the oil when the engine is cold. Make sure it's at the correct level.

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The Positive Crack Valve (PCV) is partial blocked.

This is under $10 item. You should change it.

The location of the PCV is on the top (or near top) of the valve cover.

Replace it and the oil/smoke will reciculate back to the correct path (back to the valve cover).

Your engine breather system is blocked....this means that the only way that the compression caused on ignition that is getting past the piston rings and into the block can escape is via the dipstick tube.
Check breather for kinks and some have filters ensure that these are not blocked

Blow-by will cause high pressure in the the engine as the air looking to escape from the motor. every time the engine come up on compression or exhaust stroke it create air pressure. blow by can be the rings around pistons are worned and the air can blow by the piston back down to the oil sump or the valves is not seated properly causing the air to escape through the valves back through the engine, both issue can cause high pressure build up. oil over filled can create high pressure also and can blow a seal. 1st I would have compression test on all 6 cyclinder done to see if all the cylinder has the correct amount pressure, this will give you an idea if the rings and the valves working properly. hope that help some