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Hi all, First time posting on here, apologies if i'm not posting in the right area but I'm in need of some advice if possible. I've got an A5 3.0 V6 TDI (not quattro version) and I think I've got an issue with two injectors. I've had a mobile mechanic out to look at it and he's suggesting there's nothing wrong with the injectors but there is an issue with the exhaust manifold. Issues are: Car is shaking quite a lot on idle and also when slowing down to a stop Fuel leaking from two injectors (front left and front right injectors) - I took it to a mate of mine who's good with cars and he pointed out there was diesel running down the engine from two of the injectors although it wasn't a lot. Strong smell of exhaust inside cabin (although i'd say its more like a cooking oil smell) Loud ticking noise coming from engine I had a mobile mechanic come out to look at it a week later and there was no fuel leaking from either injector, he didn't think there was an issue with them but I disagreed. He noticed some gunk at the exhaust manifold and said that it looks like the seals have gone on both sides. I've googled the issues and there seems to be a few threads about injector issues causing gunk to leak out of ports in the exhaust albeit its usually black gunk and mine isn't. I've uploaded a video of one side of the manifold, is the mobile mechanic correct in the manifold needs re-sealing or is the gunk likely caused by the injector issue? I'm not great with cars so any advice is greatly appreciated! IMG_6968.MP4

Recently purchased a 2013 A6 Avant 2.0 TDI (private), after a few 100 miles one of the injector clamp bolts came loose, have removed this to find about 5mm of thread stripped and intact in the thread of bolt, replaced the bolt with a new one to get the car running and seems to be running fine however I am weary as obviously there is now less thread to retain the new bolt. Does anyone know how deep the thread is for the clamp retaining bolt and do you think I should get this professionally repaired. I am assuming this will be something similar to a helicoil insert. Any help/advise would be appreciated, I am also interested to know if anyone else has had a similar issue and a rough guess as to how much i could expect from a garage bill.