DIPSTICK O-RINGWe have seen two different styles of Dip Stick Tubes. One style (left) has the metal spacer attached to the tube itself. The other style (right) has a small bead roll on the tube which acts as a stop for the nylon dipstick tube spacer that is separate from the tube. Porsche uses a small o-ring (red o-ring) to seal the dip stick tube to the oil pan. The o-ring is the same for both styles of tubes. In our opinion, the o-ring that Porsche uses is too small in diameter (section width) to make a good seal with the pan. There doesn't seem to be enough "squeeze" on the o-ring. So we use this second seal as an additional component to provide a dry connection. We have been installing a 2nd seal on our cars for several years and ind that it seems to help prevent an oil leak at this connection where the tube meets the oil pan.  You can see in this picture how we install both seals. It is important to install the seals on the dipstick tube before installing the tube into the oil pan. If you insert the o-ring into the oil pan, then install the tube, you run the risk of cutting the o-ring and pushing it into the oil pan since the end of the tube is somewhat sharp. We have seen this mistake several times. You should press down on the dipstick tube before tightening the attaching bolt at the intake manifold. This will put the seals in compression. 
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