Realised when I checked my tyres that the car had been diffing out as the inside tyre was much more worn that the outside tyre. Therefore tried a 5K oil and even on the worn tyres the drive improved immensely with not much change in on power slip. Put new tyres on and much more even wear pattern so will move up to a 7K to see the change again. Noticed that the top KF drivers are using 7K on med grip carpets so maybe that is the sweet spot for the X6-S as well.
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