Hello Gelbster, hello JFP in PA,
JFP in PA: thanks for adding the picture. Pictures say more than words.
In general it seems that the AOS component (diaphragm) and the connectors seems to fail. The rest of the system seems to be stable. Rubber hoses will always fail if they transport oil. It's just a matter of time and quality and heat cycles.
First, i'm not a engineer, but maybe some aspects we should consider – also a summary of the aspects you have given to the discussion (hope i didn't miss something).
- The hoses have a defined diameter. That means they have a defined maximum flow capacity.
- If the hoses are too stiff that can lead to problems caused by vibrations. Especially when the AOS / catch can is mounted to the car chassis.
- If the hoses are too elastic they may collapse by underpressure.
- The special connectors can be a problem. I don't know if the connector at the throttle can be replaced – never changed an AOS at the 096 myself.
- The hoses must be oil resistant and to some level they should be fuel and ethanol resistant. i don't think fuel and ethanol will be a main problem, because in general the fuel / ethanol part in motor oil is low. But old oil can contain aggressive substances, even if it is full synthetic.
- We need to define how tong the complete system should work without failing.
I would say if the AOS system works for 15 years without failing it will be OK. What do you think?
Mostly the aspect with Porsche classic parts is that they are expensive because they are Porsche classic parts; not because they are expensive to make.
So i did a research on both hoses and connectors and AOS. There are 2 hoses that lead to the AOS housing and it seems that they both have these special connectors on both ends. Also they differ from model year and in part numbers. So it looks like Porsche has improved the parts and you should always look for the newest version. Also the lines differs from model to model, so there might be problems to offer an one fit all solution.
AOS: 4 different versions:
- 97 A 996 107 023 51
- 98 A 996 107 023 01
- 99 A 996 107 023 04
-> 03 A 996 107 026 01
Part number 4 (hose):
Until 2002 (DE): A 996 107 147 53, A 996 107 147 54, A 996 107 147 55
From 2003 (DE): A 996 107 147 58
Part number 5 (hose):
Until M 65x 01419 (DE) 996 107 145 06 (M96.20)
Since M 65X 01420 (DE) 996 107 145 06 (M96.20)
M96.21/22 / M 96.23/24 996 107 145 06
The hoses themselves are not ultra expensive. At Amazon they are around 40-70 USD. Which is a lot of money, but not ultra overpriced for Porsche parts. And i think you could get them cheaper elsewhere.
So where to go from here? Honestly i don’t know. I don’t know if the parts are really different in detail. If they are, this will be a bigger puzzle than i thought first.
What do you guys think?
Thanks & regards, Markus
