Viscous coupler (aka AWD transfer case) on my 98 V70XC burned out after 120k. Interesting thing was that there were FOUR other XC in at SAME time for EXACTLY the same problem (all 80-120k). Coincidence? I doubt it. Am told Volvo knows clearly about problem (there is even a Technical Service Bulletin on it) but avoided it til cars out of warrantee. We have had every major service done at our Volvo dealer since 98 and NO ONE has ever even mentioned this problem. Anyone else heard of this problem?