08 Low RPM rattle

[LibJunkie]

my armada has had a rattle in the low RPM rangs that comes from underneath and maybe towards the rear of the vehicle. It has been to the dealer numerous times with nothing ever found to be causing this. This is what causes me to ask here. I recently drove a loaner from Infiniti QX56 which i drove for nearly a week. To make a long story short the infiniti had the same rattle at low rpm, also i forgot to mention the vehicle has to be moving but sometimes you can hear the sound in ours rattle up towards 50 mph. Anybody have any ideas. Oh hi all great forum thanks for letting me join.

[flyinggrape]

Use a higher octane fuel I did and no more rattle.manufacturer suggests Premium fuel.