Basic Checklist for Second Hand Vehicles

I've learned today during my conversation with Amir our driver for over 3 years now that when the meter of a car exceeded/ reached to 300,000 mileage it indicates that it must be replaced or sold out as the best life cycle of it have already consumed. He learned it when he was working on rent-a-car company wherein he used to drive luxury BMW's. 

Some third world countries still has cars running with 800,000 mileage but its already dangerous as you'll encounter more problem related to its mechanism. Thus, second hand owners will incur consistent technical fuss which means more money goes to the sink. As for the replacement of wheels he added, it is best to replace it every 6 months. 

For a neophyte like me, its beneficial to know this basic considerations, more so to those people interested to buy second hand vehicles.