Hi I have 307 sw 1.6 hdi drives good power from turbo the thing is there is a leak from the turbo. At the I thought the return pipe was leaking so off with turbo checked return pipe and changed gasket but still happening so off again. What I think it is is the seal inside the middle part of the turbo where the return pipe and oil feed is but could get to that part. So is it a new turbo or cassette or can you change the seals in the middle part somehow. Just think it's old age really 117000 on clock oil feed is good checked the back vacuum and no blockage. But the turbo is great apart from the middle leak.