2006 MERCEDES-BENZ S600

Typical onset: 70,000-110,000 mi

Symptoms: Vehicle sits nose-down or lopsided after sitting, ABC warning light with 'car too low' message, Hydraulic fluid leaks at strut spheres, Clunking over bumps, Complete suspension collapse

Fix: ABC struts fail at the pulsation dampers and valve blocks. Each corner requires strut replacement (3-4 hours labor per corner). Full four-corner job runs 16-20 hours. Hydraulic pump failures add another $2,500-3,500. Cannot drive safely when failed.

Estimated cost: $8,000-15,000

Typical onset: 80,000-130,000 mi

Symptoms: Excessive oil consumption (1 qt per 500-800 miles), Blue smoke on cold start, Cylinder misfires P0300-P0312, Low compression on multiple cylinders, Metal debris in oil

Fix: The M275 V12 has weak piston rings and cylinders score from inadequate oil flow under high boost. Requires complete engine rebuild with bore honing, oversized pistons, and updated rings. Some shops recommend short-block replacement. 60-80 hours labor for in-car rebuild, more if engine removal needed.

Estimated cost: $18,000-35,000

Typical onset: 90,000-140,000 mi

Symptoms: Harsh shifts or delayed engagement, Transmission slipping in certain gears, Check engine light with transmission codes, Burnt transmission fluid smell, Limp mode activation

Fix: The 722.9 seven-speed transmission's internal oil cooler fails, allowing coolant into ATF. This destroys the conductor plate and valve body. Requires transmission removal, complete overhaul with new torque converter, conductor plate, valve body, and external cooler installation. 18-24 hours labor.

Estimated cost: $6,500-9,500

Typical onset: 100,000-150,000 mi

Symptoms: Rattling noise on cold start for 3-5 seconds, Loss of power under acceleration, P0234 overboost or P0299 underboost codes, Wastegate rattle audible at idle, Uneven boost delivery between banks

Fix: Wastegate actuator rods seize or the flapper arms wear loose. Both turbos typically need replacement as rebuilds rarely last. Requires dropping subframe for access. 14-18 hours labor per side, usually do both.

Estimated cost: $7,000-12,000

Typical onset: 80,000-120,000 mi

Symptoms: Rear sags overnight, Compressor runs constantly, Airmatic warning light, Hissing from rear suspension, Extended ride height adjustment times

Fix: Air springs develop leaks at the bellows or upper mounts. Compressor wears from overwork. Air springs are 2-3 hours each, compressor is 3-4 hours. Usually need rear springs and compressor together. Front springs less common but fail similarly.

Estimated cost: $3,500-5,500

Typical onset: 90,000-140,000 mi

Symptoms: Multiple random misfires, Hard starting when engine is hot, Fuel smell in cabin or engine bay, Stumbling under light throttle, Injector noise clicking at idle

Fix: Direct injection system runs extremely high pressures. Injectors stick open causing rich conditions or fail closed causing lean misfires. High-pressure pump on left cylinder bank fails mechanically. Injectors are 1.5 hours each due to V12 packaging. HP pump is 6-8 hours with intake plenum removal.

Estimated cost: $4,500-8,000

Typical onset: Any mileage - age related

Symptoms: Red brake warning light with message 'brake system failure, stop vehicle', ABS and ESP lights constantly on, Accumulator pump runs constantly, Hard or spongy brake pedal, Total brake failure warning

Fix: The SBC system has a finite number of brake applications (300,000-400,000 cycles). Mercedes extended warranty through 2015 but most are now out of coverage. Requires complete SBC unit replacement. 4-6 hours labor. Some shops retrofit to conventional hydraulic brakes (15+ hours).

Estimated cost: $3,000-4,500