e34 M5 - timing chains

[silver16v]

Hi,

Im new to this forum, wondering if anyone can give a definitive answer to my question which is:

Do the timing chains on an E34 m5 need to changed at approx 100k miles? Some people say yes, others say no, you can just change the tensioners for those off a later M power engine (not sure which one)

Im seriously tempted by an E34 but I know the above work is expensive, and its hard to find a car with mileage under 100k

thanks in advance

Bob