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It actually says it in the manual. However, for me, I really never paid attention to keeping it under 4k RPM. I think I broke 1200 miles the first month.
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2015 Glacier Silver M235i/6MT
MP Front Splitter//MP CF Short Shifter//MP CF E-brake//MP LSD//Cold Weather package//Driver Assistance package//Oyster Dakota leather//Aluminum Hexagon trim//ECS Tuning Wheel Spacers//AutoPlus Rear Diffuser//HUD//Rexing DashCam//AutoID M Mirror Caps
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