I've not had to replace the lower pipe yet on anyone's car.
Strange but my theory is the hot air from the turbo blows the oil vapour straight through that pipe and when it emerges very much cooled by intercooler, the oil condenses onto the walls of the upper pipe which causes it to eventually swell and become porous .
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Newbies do now!!
1. Plenum drains..all 3 or 4 year dependent
2. Cooling fan..All speeds functioning
3. Bonnet cable divider block
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