I dont think its just a case of how many km's its got on the clock, it also depends on how the cars been driven for the 150,000kms. Assuming that the car was owned by someone young, they are most likley to not let the car warm up properly before red lining in every gear. Or maybe the cars done highway kms by a mature driver who has taken care of it. If you dont mind me asking, is the sportivo your looking at the 03 navy blue model in Syd from a dealer? If it is I can tell you right now that car has issues like you would not believe. Check if the cars got log books and call up the people who serviced it to make sure that the servicing hasnt been forged. They say that toyota motors are renowned for being "bullet proof" but thrash anything hard enough and you'll disprove that theory. In terms of major servicing, one of the other guys would have to answer that, i havent owned one long enough to know the major servicing milestones. A good gear box will only tell you how good the gear box is, so dont buy a car just based off the gear box, cause it doesnt mean anything other than its a good gear box. It wont tell you if the fuel pump is leaking or if the radiator is bent etc.