This doesn't answer your question directly but in our '98 ML the struts were replaced and we sold the vehicle before there was enough time on them to see how long they lasted. On our '00 they were replaced also and the replacement set have creaked and groaned for a long time. It is not supposed to be a safety issue. The dealer has stated that the second pair creaking is noted in my service records and if the creaking manifests itself where the dealer can hear and verify it, they will be replaced. The only solution I have been given is to replace them.

Jim W.