Can you hear it from inside the car with the hood closed? Because I hear nothing like that, but I haven't exactly listened for it.
Yes definitely can hear inside car windows up.
Maybe the electric coolant pump for the intercooler system?
That’s my thought too. I think I’m starting to hear the turbo bearings also.
I got 25,000 miles on the Michelins fronts that came on my 2018 ATS-V, but about half that on the rears. All simple street driving and no burnouts.
I believe that is the recommended shift indication when the car is not up to temp yet. When the engine is still cold the ring turns orange at around 4000 rpm. If you notice, once the car is up to operating temp they don’t show anymore and it’s time to let er rip tater chip.
There was another thread about this. They are shift rings and go from green>orange>red when you are driving aggressively. Red is redline and time to shift.
What temp is considered fully warmed up?
No, don't think so. The rings won't show up when the engine is below 158 F (per the manual). With an A10 they only show up in manual mode. M6 they are always there (temp permitting).
There’s a green gear that shows up when it’s in some type of performance mode with the A10 when you’re not in manual mode as well.
The green gear comes up when it detects you're driving more 'spiritedly' and adjusts the shifting likewise
