Hello guys! Could someone tell me what the mercedes recommended interval is for changing the timing belt / chain on a 2002 G500?
I have only 62K miles on it now, and it is regularly maintained otherwise. Can't seem to find it on google.

TIA!

Its a timing chain, can last a long time, don't mess with it.Enjoy your car, the first day your Nigerian mechanic opens anything is the beginning of the end. The only exception is serpentine belt when it starts screeching change it before it dumps you in the middle of nowhere.

Thanks, Sultaan!
So no preventive maintenance recommended on this one?

Just go by users manual, if you don't have one get very familiar with these sites.

http://fourbyfourclub.com/Manual.htm

For your how to manuals, and

http://www.benzworld.org/forums/g-class/

For owners experience, can't afford one but can share how I get to understand autos.

Those links won't help diagnose/troubleshoot. An understanding of how Mercedes gas engine works is what will help you. Diagnosing an MB issue is not as you would diagnose a BMW or an Acura. No experience or understanding, you make things worse and end in frustration and have a fancy heap of metal in the driveway. Some services will require a reset of certain parts within a family. Some parts will have to be hard-coded to the car itself, so you will need an MB handtool (or whatever it is called); some parts are never to be replaced. You can't just take a tyre out to access certain portions of the car and perform service and put it pack as though nothing has to be accounted for any further. You will get issues and an error that will not tell you that you omitted due practice. The normal thing the untrained will do is to start buying parts and replacing and the whole thing gets convoluted. Get a qualified mechanic that is familiar and has experience with MB's. Everything has to be right and to spec unless you will have an undependable vehicle.

What you should be worried about (assuming the odometer was rolled back) is an MB code 1100 or 1200 (something like that - I can't truly remember) for the 113 motor (which is what you have). It is worse for the 350/550's. It is a camshaft error code. If this ever occurs, do not replace the cam sensors. It is time to take the engine apart and do some serious work. This is the least concern for you because you don't have the 112 engine (320). I am not familiar with the 113 motor and their issues but it is an unforgiving engine when anything is out of tolerance or a wrong/incomplete procedure is done.

Find a qualified mechanic. Pneumatics is also a must when working on any Mercedes because it is extensively used in design. It is a very complicated vehicle and it is compounded when an amateur is done working on it and procedures where omitted.