Hi! It is very hard to buy truly bad gas in the UK, even the most obscure petrol sellers or at worst supermarkets don't sell petrol that would cause this kind of issue???? This includes the lowest level of octane available to buy as it all must conform to a set standard to be sold in the UK. If that bad go to trading standards and seek redress!!!!
However I would ask given some of the symptoms, did someone inadvertently put some diesel in ( you would be surprised how common this is), which would account for some oily deposits in the throttle body......If this is the case subject to how much was dumped in you may get away with a complete fuel system clean and a flush of the tank, if you have been running the car and it is well into the engine then !!!!!!!!!!
Always said I would go back to a 6 series
Last edited by 645/333; 01-22-2013 at 06:06 AM.