2014 MERCEDES-BENZ SL-Class M278 DE 40 AL/M157 DE40 AL (R231)
R231 / Convertible / Global with some market-specific engine variations
M278 DE 40 ALM157 DE40 ALOM642M276 DE 30 LAExact year/trim recordGold
Engine identity
Oils and fluids
Service and parts data
Common and chronic problems
- Air suspension leaks or failures (market dependent)
- Electronic roof mechanism issues
- Balance shaft and timing chain wear on M276 engines (observed in some markets)
First checks
- Inspect air suspension system for leaks
- Verify electronic roof operation
- Check service history for timing chain replacements
Before replacing parts
- Save fault codes and freeze-frame data before clearing anything.
- Check engine oil, coolant and transmission fluid using the correct temperature and service procedure.
- Verify power, ground, connectors, hoses, leaks and live data before replacing expensive parts.
Important notes
- Available engines and features vary by market; turbo V6 diesel offered mainly outside North America.
- No manual transmissions offered in 2014 SL-Class globally.
- Oil capacity and specs can vary with engine variant; consult official Mercedes-Benz data or dealership for precise values.