petrol's ones are better long term than diesel n47 as that engine is total mare ho nag, i would look to oil filter changes 10k max fully syn oil a must, timing chains need doing around 70k on the n18 engines as chain stretches wears the n14 before it 60k timing chain kits a must do job, the 4x4 is a soft one not very good a lot of drag and extra mpg and more to go wrong on my book,, if it snows in a 2 wheel drive car drop front tyres pressures down to 18psi and is just as effective as a soft 4x4 in my book. as for history and mileage thats everything find the lowest mileage newest for your budget with good history, a lot of car sales places are on their knees at moment due to all this brexit shite no ones seems to be buying cars much so should find some good cash up deals,, best to have the attitude when buying anything that your not bothered to buy it or not etc make a offer walk away phone them again in a week or twos time chances are they might lower the price , i do this all the time on ebay works a treat.