[bodgit]

Originally Posted by dexter24

Not sure on power loss but does feel a bit flat at times "BUT" everything else youve mentioned seems spot on, i thought the rushing noise was normal turbo noise but did think it was a bit loud so had a look and have seen a little bit of oil on a pipe but couldnt see any splits, will have another look and take a pic............

I had that problem this time last year, all the black smoke and hissing noise on acceleration.
http://www.oople.com/forums/showthread.php?t=52977
Turned out the intercooler had split and that cost me £350 fitted.
Apart from that no other part has failed on my cmax,s in 100,000 miles.