Timing Belt or chain

Hi Folks
Does the 1998 316i have a timing belt or a chain? If it is a belt when is the best time to have it changed? This is my second Compact with low milage of 56000, always been happy with them my first compact wa s sitting at 156000 miles, however had two boils where the radiator hoses had burst on two seperate ocassions sold it on and it is still running good.
Shany
Does the 1998 316i have a timing belt or a chain? If it is a belt when is the best time to have it changed? This is my second Compact with low milage of 56000, always been happy with them my first compact wa s sitting at 156000 miles, however had two boils where the radiator hoses had burst on two seperate ocassions sold it on and it is still running good.
Shany