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Ok with an auto as always it won't be perfect at first but once it warms up listen to hear/feel it clunk or not when it changes gear. Does it select gears nicely I.E going from P to D does it slide nicely or grab and take a bit of effort moving. If it clunks it may indicate wear and tear. Service wise depending on it's previous history the usual oil,filters,coolants,hoses etc would most likely need doing. Being a turbo things might be different but I've never had one to tell you sorry. There are few fellas on here with GU's they'll be able to explain more than I can but I have a GQ that's done 330k and the only major mechanical part that I know of that's been replaced is the start motor. These things will reach 500k easy as along as you service them regularly.