Heinz the sigma has a belt and my dealer told me needs doing every 8 years. I think the miles interval is 90,000 miles ( not KM) but would need to check that to be sure. Personally I'm thinking I'll get it done every 6 years just to be safe.
2015 Morgan 4/4 (Wolf fettled) previously 2014 M3W MINI Cooper S and numerous BMC/BL relics.
