sparkplug(and others) change for a 2003 540

My 540 has only about 39,800 miles on it as of last night. I am planning to replace the sprakplugs soon just because of the age of the car, and not because of of mileage. Am also looking at replacing the radiator hoses. Does this make sense?



Also, when I first start the car, I can hear some rattle coming from the engine bay. The noise goes out about 5 seconds later. What could be causing it?



Thanks..

sparkplug(and others) change for a 2003 540