I want to buy a Range Rover Sport 3.0 HSE, and I'm aiming to secure an 11 plate with 12 to 20K miles on the clock. However I have a dilemma and it’s all about the diesel engine - for years I have done as you say, let my diesel engines idle for 2-3 mins after a run (longer after a spirited drive) to let the oil circulate etc.

If I buy used, can you tell easily which engines have been looked after in this way or is it pot luck? And is it better to buy an average/higher mileage car or low to give myself the best odds of not having a turbo failure as a result of oil damage, assuming the previous owner had no or little car or engine sympathy in this way?

The car will have FSH and be from a main dealer so at least the oil should be changed on schedule?

Also with the new model Range Rover Sport coming next month when is the best time to buy an older version 11 plate and what % saving should I make given the new version will almost certainly cause added depreciation on the current model?