Premium gas is NOT necessary. This car is tuned for 87 octane, anything else goes in there you're both wasting your money, and possibly creating problems. Seafoam works great once every 2000 miles or so. Of course Chevron cleaner I think is the OEM recommended cleaner.
The rattle/noisy startup is the timing chain tensioners or other components to the timing chain causing loose behavior until oil pressure goes up. I had mine fixed under warrantee as it was real bad at startup. but to be honest, a similar sound came back anyway, not as bad, but just not worth the hassle of trying to get it fixed again. Powertrain warrantee would cover this fix anyway, so I'm not worried until outside of 100k
Few things to note, don't go base model premium. Get at very least the Lux package, or Lux/Tech...top of the line is Limited. Depending on mileage and condition, you can get a 2014 limited for around $17,000 up to $20,000 list price, of course haggle that down as much as possible. Base model is missing SO much compared with at minimum the Lux package. Couple of easy ways to know, if there's the electric window shade in the back window, also the giant LCD in the center of the drivers console for the Speedometer, then it's at least Lux, and going to have HID adaptive headlights.
Last, note too that if it's not certified the powertrain warrantee does not transfer to second owner. Only base warrantee of 5year/60,000miles is transferable. So don't get one with 70,000 miles thinking you still have 30,000 miles of powertrain...because you wont.
Last edited by MadMax; 05-01-2018 at 01:06 PM.