This is a conclusion of my initial thread of misfires and rough running on my 2014 RS7, a broken 4.0TT valve spring ($20!) on cylinder #8, at 49,000mi. No tunes, no hard driving, this happened at 1,500 RPM in the neighborhood. There's no way to fix it other than drop the engine and transmission and take the engine head off for replacement. Total end-end cost for the one spring performed by a top indie shop, $8,000. We calculated Audi would have charged more than $15,000 for this, Audi wanted $6,100 just to 'start' the exploration. Of course this happened 4 weeks after my extended warranty expired! - there's no way Audi would have covered this under good faith even though I've bought 6 Audi's from them over the last few years, they wouldn't have carried the risk of potentially an entirely new engine if it was something else which would have sunk them more than $30,000.
Moral of this story, sell before warranty expires and/or get the 10 year warranty. When these things break, they break the bank!! But there is a 'price to play' with these high end toys when they get up in their vintage

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