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I have had varied results when running BP/BP Ultimate with both Petrol and Diesel. When my F30 316d Arrives i intend on just running it on either Standard BP or Shell Fuel Save for at least a 1000 Miles or so to let the engine run in a bit and then maybe run a tank or two of Ultimate / VPower and see if it makes any differences. I reckon its likely to make it run smoother. Saying that though on the current car I have (An 06 Astra) Ultimate was lovely up until I had it serviced and had the engine flushed, after that the engine used to hesitate and end up using more fuel since then I have used normal BP or Shell and the engine has been fine ever since.
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