The prevailing view is that R129s are underappreciated and 'ridiculously good values,' with many sellers and owners predicting appreciation. Skeptics note plentiful supply keeps prices soft and that, unlike a 911, the SL is a narrower market where you don't reliably get your maintenance money back. …
Market values: undervalued, appreciating, but a narrow market
Mercedes-Benz SL (R129) · market