Original owner (8.5 years) of 2011 GLS with 46k miles and boy has it gotten noisy. i must have that same metal can under the hood! I check oil level weekly, very little consumption. Cold here in Ohio but who knows....Service says now new recall "ecm cluster update" #953 is due.
2011 Sonata GLS, 114,000 miles. Been pinging like marbles in a metal can. Tried Mobil 89 octane, still pings. Also uses oil. Started last year. Extended bumper-to-bumper warranty expired Dec 11th 2018 (9 days ago)!
Concerned that the 953 campaign may be too sensitive and trigger limp-home mode excessively. But i'm sure HMA knows best <smh>