Hi what you read for any 6 series model up to the start of the F12/ F13 2011 onwards will be the same as the 645 and the 650 are 99.5% the same cars with mostly cosmetic upgrades throughout, same N62 Engine and transmission. In the UK and Europe we have the 3.0ltr and diesel models which have different reliability issues, but no where near the issues of the N62 engine.
Second point is not all cars will suffer the same symptoms and faults, some cars will have no issue whatsoever and run for long and happy miles. What gets reported on forums by their very nature will often air on the side of negative!!!! Some guys have hit 150K and no problems at all.
I do believe that their are real differences between countries and the model build that each country gets, as there are subtle differences......Also the extremes of climate can make a big difference.
Always said I would go back to a 6 series
Last edited by 645/333; 12-06-2012 at 11:25 AM.