Should I use theseTelescopic oil return tubes?
 

I found these in one of the many boxes of parts that came with my recently acquired Porsche.
Assuming I can get new O-rings, would these be a wise choice on my street driven car?

http://forums.pelicanparts.com/uploa...1762709109.jpg
http://forums.pelicanparts.com/uploa...1762709109.jpg

I would never use expandable tubes on a fresh build. They offer 4 more possibilities for potential oil leaks.
I see expandable tubes as a Band-Aid never a proper build option.
If you are forced to use an expandable tube/two I would use the factory version.

Thank you very much for this advice! That was kind of my thought process as well, but I wanted an expert opinion. I will put these in a display case.

Keep them around in case you ever need to remove/replace one of the permanent ones for whatever reason. The expandable ones are the way to do that without pulling the heads (which is their purpose).

IF you have a leak at the orings of the stock tubes, and do not want to pull your engine apart, these, or similar expandable ones are the only option. IF motor is apart, never use these, only use one piece ones.

Cheers