1988 Model designation: 928 S4 / 928 CS / 928 SE (UK) Engine displacement: 5.0 L Valves: Four per cylinder Power: 320 PS (316 hp, 236 kW) (S4, CS and SE) / 300 PS (296 hp, 221 kW) (S4) for Australia Changes: Lighter 928 CS "Club Sport" version available in Continental Europe and USA, 928 SE (S4 Sport) in UK. Only model year for "CS" (USA) and "SE" (UK). "CS" uses different VIN sequence than normal "S4". Stronger torque tube with 3 mm thicker center shaft for automatic transmission. Pistons with strengthened skirt installed in February 1988. Oil drainage improved in piston skirts.
1988 Model designation: 928 S4 / 928 CS / 928 SE (UK) Engine displacement: 5.0 L Valves: Four per cylinder Power: 320 PS (316 hp, 236 kW) (S4, CS and SE) / 300 PS (296 hp, 221 kW) (S4) for Australia Changes: Lighter 928 CS "Club Sport" version available in Continental Europe and USA, 928 SE (S4 Sport) in UK. Only model year for "CS" (USA) and "SE" (UK). "CS" uses different VIN sequence than normal "S4". Stronger torque tube with 3 mm thicker center shaft for automatic transmission. Pistons with strengthened skirt installed in February 1988. Oil drainage improved in piston skirts.