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I had this issue with my last BMW - N/A 2.5 litre 6 so possibly different - but it would hesitate under the first couple of accelerations of the day mainly on a cold morning then run perfectly.
I was led to understand that it had to do with oil viscosity and pressure affecting the way VANOS changed the timing and that the engine needed a few minutes for the oil to properly circulate for the system to work optimally.
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John
17 F87 M2 Pure - long beach blue
10 E91 320d LCI - space grey - black dakota - steptronic - innovations - 157s - front PDC - Konis
99 BMW Baby Racer - red; 05 Renaultsport Clio 182 Cup - French Racing Blue - Konis - Eibachs - Remus - Turinis
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