here is a pic of a 23yr old return line (147k miles). You can squeeze the hose and your hand will be soaked in hydraulic fluid. I started noticing an odd leak where I park my car and this was the culprit. Surprisingly all the other lines for the system are still ok at this time. No leaks, no sweating and no swelling from the lines. I replaced it using a fuel hose rated at 50psi. It has been 1 week and so far so good.

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2001 E55

2001 E320 Sedan

2001 Subaru Legacy

2006 SLK280

2016 Subaru Outback 3.6

I have just completed this line splice but I only had a single flare tool at my disposal. Leak test was a success. Now to clean up and get some sleep.

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85 300D 3 pedal. Current project.
83 300TD (need rear wiper assembly dead or alive)
84 300SD Daily driver
85 300TD almost 400k miles and driven daily.
98 E300D *sold
86 300SDL *sold and made flawless 10 hour journey to new home.