2008 Mercedes-Benz S550 Service and Repair Manual

This factory service and repair manual for the 2008 Mercedes-Benz S550 applies to the four-door sedan in Base and 4Matic form. Both use the same engine: a gasoline V8 displacing 5.5 liters (333 cu in), breathing without a turbocharger or supercharger and fitted with double overhead camshafts. The manual gives specifications for that shared V8 and driveline procedures for the 4Matic trim.

Engines covered

• 5.5L V8 (333 cu in) — DOHC, naturally aspirated, gasoline

Body styles covered

• 4-door sedan

Trims covered

• Base
• 4Matic

Known issues on the 2008 S550. NHTSA filed two recalls against the 2008 S-Class line. One involved certain vehicles whose front signal acquisition and actuation module used transistors stored in damp conditions, so heat during soldering could damage them and upset the functions they control. The other covered certain vehicles given wrong software calibration coding during a workshop visit, which could keep the fuel pump from shutting off after a crash. The S550's own 19 owner complaints cluster on the electrical system and tires, four each; 1 complaint reported a crash and 1 an injury. Wiring diagrams and fuel system diagnostics cover both areas.