welcome aboard and congrats on the truck...

keep an eye on the leak, the bmw engines do NOT like being overheated (like any other manuf likes their engines being overheated??)...

anyways, if you have a chance, check the radiator hose on the bottom right (as you are sitting behind steering wheel), sometimes the plastic neck is crumbling there and causes leak... the leak can come from an old, rotted hose... from a temp sensor seal that is in the same area... of course, from a damaged radiator itself...

you need to pinpoint the leak location to decide on the repairs... usually BMW cooling system needs to be repaired as a whole, as the components that are good today, will fail tomorow, as soon as you finish the repair...

does the engine overheat? say, if there is air syphoned in, an airbubble may overheat the engine... you may wish to unlock the on board computer's functions and see the temeprature as you drive, or just keep an eye on the temp needle...

run your vin through the bmwvin . com to see what options are installed in your car, this wil lhelp you in parts ordering...