You just have to remember to idle the engine before switching off whenever you stop and the turbo is red hot, which it can be when you stop for fuel on a motorway, when you stop after a long ascent, or when you stop after towing. Particularly after towing. If the end of your journey involves driving at moderate engine speeds (for example through a town or village), that does the same job as idling. I’d concur that the 530d is the best incarnation of the 5-Series Gran Turismo and the best car I can think of for four people to cover very large distances. It’s also relatively low CO2 at 173g/km, so low tax.