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Originally Posted by Ashok Arora
"Gearbox slave cylinder leaking into bell housing - losing pressure - whole unit has to be changed".
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Well what can I say, **** happens.

Just that it should happen twice to you, you're a very unlucky man.
BMW is not to blame about the leaking cylinder. BMW is to blame that they didn't have a better way of daignosing this problem. It is a very common problem with hydraulic clutches, Mazda and Toyota are renouwned for these problems.
A leaking slave cylinder isn't really a huge problem, most of the time the master will seperate enough to allow shifting. The car is still driveable as if nothing happend, you just need a replacement asap. It does become a problem however when badly engineered software prevents you from doing any normal driving.
Anyway let this be a learning experience for all of us. Eventualy those cylinders will need replacing on everybodies car so if the same happens to your car a few years down the line you know what todo.
The question which is stuck in my mind,
why did they replace the whole gearbox? I'm sure BMW has those cylinders in abundance, so why not just replace the cylinder instead of the whole gearbox? It's much cheaper for one. Did you insist they replace the gearbox?