If it reoccurred in 30 miles I'd have a serious talk with the service manager if they want any more money to check it out. They may have found and corrected a problem (which I'm sure they'll argue), but they obviously didn't find the problem. I'd expect a re-check for free and once I got a diagnosis, I may expect a repair for free.
What your repair indicates is that they found bad valve that wasn't sealing properly (low compression) which was making the engine run on 5 cylinders. They took the top half of the engine off (intake manifold, both cylinder heads, timing chains, and more) and replaced the timing chains and all exhaust valves.
That's a lot of work, I believe it involves dropping the engine, and the price you paid isn't out of line for the work they did. The real question is what did they miss?
A common mistake is finding and fixing the end result but missing the cause. I wonder what caused the burnt valve in the first place?
What your repair indicates is that they found bad valve that wasn't sealing properly (low compression) which was making the engine run on 5 cylinders. They took the top half of the engine off (intake manifold, both cylinder heads, timing chains, and more) and replaced the timing chains and all exhaust valves.
That's a lot of work, I believe it involves dropping the engine, and the price you paid isn't out of line for the work they did. The real question is what did they miss?
A common mistake is finding and fixing the end result but missing the cause. I wonder what caused the burnt valve in the first place?
