The variocam kicks in at 4200 rpm on our 2.5's; the car is designed to be driven in the 4-5k rpm range.
I run mine up to 6k routinely when I take it out to drive the car for the sake of driving the car.
I don't keep it at 6k though while cruising at any speed. No sense wearing out the engine.
Conversely, wearing out my engine would give me a great excuse to put a 3.4 in it!
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