Yeah I thought about getting another lump dropped in, but I could end up inheriting a load of new problems.
Yeah he's gonna do a full check of the pistons, injectors, cams & camshaft make sure they've not gone (as you put it) chocolatey...lol
He may discover that nothings melted and he can repair the fault at minimal cost.....but that's my wishful thinking.
The thing with the wrong oil went on for ages, I got them to get a guy out to take a sample of the oil and send it off to castrol for analysis. The results came back but to the garage that did the service, and they wouldn't send me a copy (dodgey right?). Anyways they told me what oil went in (i can't remember what it was now, i think it wasn't the long life and a different w rating or the other number) and I tried to get VW to tell me the effect of putting that oil in the car in writing but got nowhere. I looked at getting a solicitor on to it but decided that it could just end up costing me even more, and after the repair bill i was fairly skint. So annoyingly I had to do exactly what the servicers wanted me to do and draw a line under it, walk away and put it down to experience.