Purchased used 2014 Cadenza with 40,000 miles on July 11 2016. Drove it twice before I purchased it; each time the salesman started it up and brought it from the lot to the sales area. Never noticed rattle or vibration since it was already running for many seconds. Never really noticed problem for a week or so after I purchased it; excited I guess with what appeared to be a great car. Love every aspect of the car other than start-up rattle and vibration which lasts about 15-20 seconds. It must have every possible option as the sticker in glove box says MSRP around $45,000. Reading forum info it appears that there is not a lasting fix for the problems I have. Any one have any insight into how many miles before engine destruction or it just an annoyance?