A Mercedes SLK, with its folding hard-top, is a tempting buy, especially as the season shifts towards autumn. John Evans tells you what to look for and how much to pay. Galvanised Mercedes convertible: surely the recipe for a top used car, isn't it? Better still, prices for the model that meets this description, the R171-series SLK from 2004 to 2011, start from just ￡2500 for an early, entry-level version.
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