I'm currently at 229,900 miles - I too wish Buick still made the Riviera. It is the most trouble-free car I have ever owned. It always starts, runs and rides like a dream. My dealership says they have seen one Riv with 250,000 miles on it - I see one post here with 283,000 miles. The tape player quit at 100,000 miles (remember tapes ?) and the clearcoat on the paint failed in one small place on the fender. Otherwise it looks like a new car !
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