VW Transporter T5 08 2.5 BPC 4Motion oil and exhaust leak back of engine around turbo

Hi all
For quite a while occasionally at traffic lights I get a strong exhaust smell in the cabin.
Now an oil leak has started at the back of the engine around the turbo becoming full of oil.
Took it to my VW mechanic and he said that there is an exhaust leak in the turbo gasket and because there is quite a bit of oil around the turbo he thinks that it might need a new turbo but will not know until the turbo is out.
Because it's 4Motion apparently it's a massive job to change the turbo gasket around $1000 labour alone.
The turbo has plenty of power no noticeable noise or smoke.
Spoke with a turbo specialist on the phone and he thinks that it might just need the bolts tightened around the turbo to fix the exhaust leak and the oil leak might be caused by the rocket cover breather tube being blocked.
Any insights would be appreciated.
Peter

VW Transporter T5 08 2.5 Tdi BPC 4Motion Manual LWB with Particular Filter

There have been for many years issues with cracks in the manifold of the 2.5 engine , there is a thread on it somewhere on the forum .

T5 AXE Turbo Oil feed lines

Had the kerosene smell issue twice, on 08 had oil leak and replaced turbo gasket but occasionally still smelled and also on 12 with engine back pressure from blocked dpf I reckon

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Originally Posted by Sunny43.5

There have been for many years issues with cracks in the manifold of the 2.5 engine , there is a thread on it somewhere on the forum .

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Thanks for that!
My T5 is a 12/2008 BPC and should come with a cast manifold what doesn't have the same cracking problems as far I know.